77220628996 has 81 divisors (see below), whose sum is σ = 164521684551. Its totient is φ = 31618980624.

The previous prime is 77220628993. The next prime is 77220629021. The reversal of 77220628996 is 69982602277.

The square root of 77220628996 is 277886.

It is a perfect power (a square), and thus also a powerful number.

It is a self number, because there is not a number n which added to its sum of digits gives 77220628996.

It is not an unprimeable number, because it can be changed into a prime (77220628993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 89478861 + ... + 89479723.

Almost surely, 2^77220628996 is an apocalyptic number.

77220628996 is the 277886-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77220628996

77220628996 is an abundant number, since it is smaller than the sum of its proper divisors (87301055555).

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

77220628996 is an equidigital number, since it uses as much as digits as its factorization.

77220628996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790 (or 895 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 58.

The spelling of 77220628996 in words is "seventy-seven billion, two hundred twenty million, six hundred twenty-eight thousand, nine hundred ninety-six".