77419572978 has 32 divisors (see below), whose sum is σ = 168925512960. Its totient is φ = 23459076560.

The previous prime is 77419572941. The next prime is 77419573003. The reversal of 77419572978 is 87927591477.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1812301 + ... + 1854527.

It is an arithmetic number, because the mean of its divisors is an integer number (5278922280).

Almost surely, 2^77419572978 is an apocalyptic number.

77419572978 is an abundant number, since it is smaller than the sum of its proper divisors (91505939982).

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

77419572978 is a wasteful number, since it uses less digits than its factorization.

77419572978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70022.

The product of its digits is 62233920, while the sum is 66.

The spelling of 77419572978 in words is "seventy-seven billion, four hundred nineteen million, five hundred seventy-two thousand, nine hundred seventy-eight".