640306576 has 40 divisors (see below), whose sum is σ = 1526888384. Its totient is φ = 253307520.

The previous prime is 640306561. The next prime is 640306577. The reversal of 640306576 is 675603046.

It is a super-2 number, since 2×640306576² = 819985022537687552, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640306577) 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, 218430 + ... + 221341.

Almost surely, 2^640306576 is an apocalyptic number.

It is an amenable number.

640306576 is an abundant number, since it is smaller than the sum of its proper divisors (886581808).

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

640306576 is a wasteful number, since it uses less digits than its factorization.

640306576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439799 (or 439793 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 640306576 is about 25304.2797961135. The cubic root of 640306576 is about 861.9114577904.

The spelling of 640306576 in words is "six hundred forty million, three hundred six thousand, five hundred seventy-six".