77938946580 has 96 divisors (see below), whose sum is σ = 250597992960. Its totient is φ = 17899850880.

The previous prime is 77938946557. The next prime is 77938946651. The reversal of 77938946580 is 8564983977.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3095074 + ... + 3120153.

It is an arithmetic number, because the mean of its divisors is an integer number (2610395760).

Almost surely, 2^77938946580 is an apocalyptic number.

It is an amenable number.

77938946580 is an abundant number, since it is smaller than the sum of its proper divisors (172659046380).

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

77938946580 is a wasteful number, since it uses less digits than its factorization.

77938946580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6215269 (or 6215267 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 66.

The spelling of 77938946580 in words is "seventy-seven billion, nine hundred thirty-eight million, nine hundred forty-six thousand, five hundred eighty".