77220776 has 32 divisors (see below), whose sum is σ = 152185440. Its totient is φ = 36687168.

The previous prime is 77220757. The next prime is 77220791. The reversal of 77220776 is 67702277.

It is a hoax number, since the sum of its digits (38) 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, 9695 + ... + 15761.

It is an arithmetic number, because the mean of its divisors is an integer number (4755795).

Almost surely, 2^77220776 is an apocalyptic number.

It is an amenable number.

77220776 is a deficient number, since it is larger than the sum of its proper divisors (74964664).

77220776 is a wasteful number, since it uses less digits than its factorization.

77220776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6153 (or 6149 counting only the distinct ones).

The product of its (nonzero) digits is 57624, while the sum is 38.

The square root of 77220776 is about 8787.5352630871. The cubic root of 77220776 is about 425.8383010957.

The spelling of 77220776 in words is "seventy-seven million, two hundred twenty thousand, seven hundred seventy-six".