640633524 has 12 divisors (see below), whose sum is σ = 1494811584. Its totient is φ = 213544504.

The previous prime is 640633517. The next prime is 640633531. The reversal of 640633524 is 425336046.

640633524 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 (640633517) and next prime (640633531).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×640633524² = 820822624145317152, which contains 22 as substring.

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, 26693052 + ... + 26693075.

It is an arithmetic number, because the mean of its divisors is an integer number (124567632).

Almost surely, 2^640633524 is an apocalyptic number.

It is an amenable number.

640633524 is an abundant number, since it is smaller than the sum of its proper divisors (854178060).

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

640633524 is a wasteful number, since it uses less digits than its factorization.

640633524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53386134 (or 53386132 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 33.

The square root of 640633524 is about 25310.7393017272. The cubic root of 640633524 is about 862.0581335069.

The spelling of 640633524 in words is "six hundred forty million, six hundred thirty-three thousand, five hundred twenty-four".