640035902 has 16 divisors (see below), whose sum is σ = 1047745152. Its totient is φ = 290810520.

The previous prime is 640035883. The next prime is 640035911. The reversal of 640035902 is 209530046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79013 + ... + 86735.

It is an arithmetic number, because the mean of its divisors is an integer number (65484072).

Almost surely, 2^640035902 is an apocalyptic number.

640035902 is a deficient number, since it is larger than the sum of its proper divisors (407709250).

640035902 is a wasteful number, since it uses less digits than its factorization.

640035902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11503.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 640035902 is about 25298.9308469745. The cubic root of 640035902 is about 861.7899899852.

Adding to 640035902 its reverse (209530046), we get a palindrome (849565948).

The spelling of 640035902 in words is "six hundred forty million, thirty-five thousand, nine hundred two".