640033625 has 64 divisors (see below), whose sum is σ = 1030648320. Its totient is φ = 385056000.

The previous prime is 640033609. The next prime is 640033631. The reversal of 640033625 is 526330046.

It is not a de Polignac number, because 640033625 - 2⁴ = 640033609 is a prime.

It is a super-2 number, since 2×640033625² = 819286082261281250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 277979 + ... + 280271.

It is an arithmetic number, because the mean of its divisors is an integer number (16103880).

Almost surely, 2^640033625 is an apocalyptic number.

It is an amenable number.

640033625 is a deficient number, since it is larger than the sum of its proper divisors (390614695).

640033625 is a wasteful number, since it uses less digits than its factorization.

640033625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355 (or 2345 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 640033625 is about 25298.8858450328. The cubic root of 640033625 is about 861.7889680123.

The spelling of 640033625 in words is "six hundred forty million, thirty-three thousand, six hundred twenty-five".