640776224 has 24 divisors (see below), whose sum is σ = 1376213328. Its totient is φ = 291261760.

The previous prime is 640776221. The next prime is 640776247. The reversal of 640776224 is 422677046.

It is not an unprimeable number, because it can be changed into a prime (640776221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909842 + ... + 910545.

It is an arithmetic number, because the mean of its divisors is an integer number (57342222).

Almost surely, 2^640776224 is an apocalyptic number.

It is an amenable number.

640776224 is an abundant number, since it is smaller than the sum of its proper divisors (735437104).

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

640776224 is a wasteful number, since it uses less digits than its factorization.

640776224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820408 (or 1820400 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 38.

The square root of 640776224 is about 25313.5581062797. The cubic root of 640776224 is about 862.1221360701.

The spelling of 640776224 in words is "six hundred forty million, seven hundred seventy-six thousand, two hundred twenty-four".