640930536 has 32 divisors (see below), whose sum is σ = 1780363200. Its totient is φ = 213643440.

The previous prime is 640930531. The next prime is 640930541. The reversal of 640930536 is 635039046.

640930536 is a `hidden beast` number, since 640 + 9 + 3 + 0 + 5 + 3 + 6 = 666.

640930536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (640930531) and next prime (640930541).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 640930536.

It is not an unprimeable number, because it can be changed into a prime (640930531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1483420 + ... + 1483851.

It is an arithmetic number, because the mean of its divisors is an integer number (55636350).

Almost surely, 2^640930536 is an apocalyptic number.

It is an amenable number.

640930536 is an abundant number, since it is smaller than the sum of its proper divisors (1139432664).

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

640930536 is a wasteful number, since it uses less digits than its factorization.

640930536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967286 (or 2967276 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The square root of 640930536 is about 25316.6059336555. The cubic root of 640930536 is about 862.1913360541.

The spelling of 640930536 in words is "six hundred forty million, nine hundred thirty thousand, five hundred thirty-six".