76221056640 has 128 divisors (see below), whose sum is σ = 255741825600. Its totient is φ = 19255836672.

The previous prime is 76221056617. The next prime is 76221056647. The reversal of 76221056640 is 4665012267.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (76221056647) 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, 1008217 + ... + 1081176.

Almost surely, 2^76221056640 is an apocalyptic number.

It is an amenable number.

76221056640 is an abundant number, since it is smaller than the sum of its proper divisors (179520768960).

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

76221056640 is a wasteful number, since it uses less digits than its factorization.

76221056640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089434 (or 2089422 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 76221056640 in words is "seventy-six billion, two hundred twenty-one million, fifty-six thousand, six hundred forty".