640381032 has 32 divisors (see below), whose sum is σ = 1778836800. Its totient is φ = 213460272.

The previous prime is 640381003. The next prime is 640381037. The reversal of 640381032 is 230183046.

It is a happy number.

640381032 is a `hidden beast` number, since 640 + 3 + 8 + 10 + 3 + 2 = 666.

It is a super-2 number, since 2×640381032² = 820175732290770048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 640380987 and 640381005.

It is not an unprimeable number, because it can be changed into a prime (640381037) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1482148 + ... + 1482579.

It is an arithmetic number, because the mean of its divisors is an integer number (55588650).

Almost surely, 2^640381032 is an apocalyptic number.

It is an amenable number.

640381032 is an abundant number, since it is smaller than the sum of its proper divisors (1138455768).

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

640381032 is a wasteful number, since it uses less digits than its factorization.

640381032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2964742 (or 2964732 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 640381032 is about 25305.7509669245. The cubic root of 640381032 is about 861.9448647002.

The spelling of 640381032 in words is "six hundred forty million, three hundred eighty-one thousand, thirty-two".