640250336 has 96 divisors (see below), whose sum is σ = 1410877440. Its totient is φ = 283571200.

The previous prime is 640250329. The next prime is 640250341. The reversal of 640250336 is 633052046.

It is a super-2 number, since 2×640250336² = 819840985496225792, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640250299 and 640250308.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 3352001 + ... + 3352191.

It is an arithmetic number, because the mean of its divisors is an integer number (14696640).

Almost surely, 2^640250336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640250336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (705438720).

640250336 is an abundant number, since it is smaller than the sum of its proper divisors (770627104).

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

640250336 is a wasteful number, since it uses less digits than its factorization.

640250336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 400 counting only the distinct ones).

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

The square root of 640250336 is about 25303.1684972456. The cubic root of 640250336 is about 861.8862223165.

The spelling of 640250336 in words is "six hundred forty million, two hundred fifty thousand, three hundred thirty-six".