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1388755264 = 26131669177
BaseRepresentation
bin101001011000110…
…1011100101000000
310120210012002002011
41102301223211000
510321010132024
6345445502304
746262140111
oct12261534500
93523162064
101388755264
11652a09426
12329111994
131919424a0
14d2626208
1581dc3094
hex52c6b940

1388755264 has 28 divisors (see below), whose sum is σ = 2967798484. Its totient is φ = 640963584.

The previous prime is 1388755229. The next prime is 1388755301. The reversal of 1388755264 is 4625578831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 243609664 + 1145145600 = 15608^2 + 33840^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833757 + ... + 835420.

It is an arithmetic number, because the mean of its divisors is an integer number (105992803).

Almost surely, 21388755264 is an apocalyptic number.

It is an amenable number.

1388755264 is an abundant number, since it is smaller than the sum of its proper divisors (1579043220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1388755264 is a wasteful number, since it uses less digits than its factorization.

1388755264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669202 (or 1669192 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 49.

The square root of 1388755264 is about 37266.0068158637. The cubic root of 1388755264 is about 1115.6858011613.

The spelling of 1388755264 in words is "one billion, three hundred eighty-eight million, seven hundred fifty-five thousand, two hundred sixty-four".

Divisors: 1 2 4 8 13 16 26 32 52 64 104 208 416 832 1669177 3338354 6676708 13353416 21699301 26706832 43398602 53413664 86797204 106827328 173594408 347188816 694377632 1388755264