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, 2^642654285 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".