640854352 has 20 divisors (see below), whose sum is σ = 1242191700. Its totient is φ = 320288768.

The previous prime is 640854337. The next prime is 640854407. The reversal of 640854352 is 253458046.

It can be written as a sum of positive squares in 2 ways, for example, as 568536336 + 72318016 = 23844^2 + 8504^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36774 + ... + 51322.

It is an arithmetic number, because the mean of its divisors is an integer number (62109585).

Almost surely, 2^640854352 is an apocalyptic number.

It is an amenable number.

640854352 is a deficient number, since it is larger than the sum of its proper divisors (601337348).

640854352 is a wasteful number, since it uses less digits than its factorization.

640854352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17310 (or 17304 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

The square root of 640854352 is about 25315.1012638701. The cubic root of 640854352 is about 862.1571733361.

The spelling of 640854352 in words is "six hundred forty million, eight hundred fifty-four thousand, three hundred fifty-two".