640771224 has 64 divisors (see below), whose sum is σ = 1629373440. Its totient is φ = 209952000.

The previous prime is 640771223. The next prime is 640771231. The reversal of 640771224 is 422177046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640771223) 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, 852849 + ... + 853599.

It is an arithmetic number, because the mean of its divisors is an integer number (25458960).

Almost surely, 2^640771224 is an apocalyptic number.

It is an amenable number.

640771224 is an abundant number, since it is smaller than the sum of its proper divisors (988602216).

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

640771224 is a wasteful number, since it uses less digits than its factorization.

640771224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320 (or 1316 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 640771224 is about 25313.4593447834. The cubic root of 640771224 is about 862.1198936742.

The spelling of 640771224 in words is "six hundred forty million, seven hundred seventy-one thousand, two hundred twenty-four".