640250039 has 16 divisors (see below), whose sum is σ = 796430880. Its totient is φ = 505666560.

The previous prime is 640250029. The next prime is 640250041. The reversal of 640250039 is 930052046.

640250039 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 640250039 - 2²⁰ = 639201463 is a prime.

It is a super-2 number, since 2×640250039² = 819840224879003042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640249993 and 640250020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640250029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129254 + ... + 134115.

It is an arithmetic number, because the mean of its divisors is an integer number (49776930).

Almost surely, 2^640250039 is an apocalyptic number.

640250039 is a deficient number, since it is larger than the sum of its proper divisors (156180841).

640250039 is a wasteful number, since it uses less digits than its factorization.

640250039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263410.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 640250039 is about 25303.1626284147. The cubic root of 640250039 is about 861.8860890456.

The spelling of 640250039 in words is "six hundred forty million, two hundred fifty thousand, thirty-nine".