640272959 has 16 divisors (see below), whose sum is σ = 661847040. Its totient is φ = 619164000.

The previous prime is 640272947. The next prime is 640273003. The reversal of 640272959 is 959272046.

It is a cyclic number.

It is not a de Polignac number, because 640272959 - 2¹⁶ = 640207423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640272929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1183229 + ... + 1183769.

It is an arithmetic number, because the mean of its divisors is an integer number (41365440).

Almost surely, 2^640272959 is an apocalyptic number.

640272959 is a deficient number, since it is larger than the sum of its proper divisors (21574081).

640272959 is a wasteful number, since it uses less digits than its factorization.

640272959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 640272959 is about 25303.6155321725. The cubic root of 640272959 is about 861.8963736699.

The spelling of 640272959 in words is "six hundred forty million, two hundred seventy-two thousand, nine hundred fifty-nine".