77922978 has 32 divisors (see below), whose sum is σ = 179051136. Its totient is φ = 22146048.

The previous prime is 77922967. The next prime is 77922991. The reversal of 77922978 is 87922977.

It is a self number, because there is not a number n which added to its sum of digits gives 77922978.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3300 + ... + 12912.

It is an arithmetic number, because the mean of its divisors is an integer number (5595348).

Almost surely, 2^77922978 is an apocalyptic number.

77922978 is an abundant number, since it is smaller than the sum of its proper divisors (101128158).

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

77922978 is a wasteful number, since it uses less digits than its factorization.

77922978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9818.

The product of its digits is 889056, while the sum is 51.

The square root of 77922978 is about 8827.3992772503. The cubic root of 77922978 is about 427.1251856496.

Subtracting 77922978 from its reverse (87922977), we obtain a palindrome (9999999).

The spelling of 77922978 in words is "seventy-seven million, nine hundred twenty-two thousand, nine hundred seventy-eight".