77221056 has 56 divisors (see below), whose sum is σ = 222894144. Its totient is φ = 23399680.

The previous prime is 77221049. The next prime is 77221069. The reversal of 77221056 is 65012277.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16170 + ... + 20393.

Almost surely, 2^77221056 is an apocalyptic number.

It is an amenable number.

77221056 is an abundant number, since it is smaller than the sum of its proper divisors (145673088).

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

77221056 is a wasteful number, since it uses less digits than its factorization.

77221056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36589 (or 36579 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 77221056 is about 8787.5511947300. The cubic root of 77221056 is about 425.8388157870.

It can be divided in two parts, 7722 and 1056, that added together give a palindrome (8778).

The spelling of 77221056 in words is "seventy-seven million, two hundred twenty-one thousand, fifty-six".