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642654285 = 35713677027
BaseRepresentation
bin100110010011100…
…010000001001101
31122210021012221120
4212103202001031
52304004414120
6143434151153
721632320440
oct4623420115
91583235846
10642654285
112aa841749
1215b2824b9
13a31b1610
14614cb657
153b646140
hex264e204d

642654285 has 64 divisors (see below), whose sum is σ = 1284605952. Its totient is φ = 267100416.

The previous prime is 642654277. The next prime is 642654319. The reversal of 642654285 is 582456246.

It is a happy number.

It is not a de Polignac number, because 642654285 - 23 = 642654277 is a prime.

It is a super-2 number, since 2×6426542852 = 826009060057722450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 87942 + ... + 94968.

It is an arithmetic number, because the mean of its divisors is an integer number (20071968).

Almost surely, 2642654285 is an apocalyptic number.

642654285 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

642654285 is a deficient number, since it is larger than the sum of its proper divisors (641951667).

642654285 is a wasteful number, since it uses less digits than its factorization.

642654285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7122.

The product of its digits is 460800, while the sum is 42.

The square root of 642654285 is about 25350.6269153250. The cubic root of 642654285 is about 862.9635835929.

The spelling of 642654285 in words is "six hundred forty-two million, six hundred fifty-four thousand, two hundred eighty-five".

Divisors: 1 3 5 7 13 15 21 35 39 65 67 91 105 195 201 273 335 455 469 871 1005 1365 1407 2345 2613 4355 6097 7027 7035 13065 18291 21081 30485 35135 49189 91351 91455 105405 147567 245945 274053 456755 470809 639457 737835 1370265 1412427 1918371 2354045 3197285 3295663 6120517 7062135 9591855 9886989 16478315 18361551 30602585 42843619 49434945 91807755 128530857 214218095 642654285