77992980 has 48 divisors (see below), whose sum is σ = 235181184. Its totient is φ = 19198080.

The previous prime is 77992973. The next prime is 77992997. The reversal of 77992980 is 8929977.

It is a happy number.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 49216 + ... + 50775.

It is an arithmetic number, because the mean of its divisors is an integer number (4899608).

Almost surely, 2^77992980 is an apocalyptic number.

It is an amenable number.

77992980 is an abundant number, since it is smaller than the sum of its proper divisors (157188204).

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

77992980 is a wasteful number, since it uses less digits than its factorization.

77992980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100016 (or 100014 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 51.

The square root of 77992980 is about 8831.3634281463. The cubic root of 77992980 is about 427.2530498092.

The spelling of 77992980 in words is "seventy-seven million, nine hundred ninety-two thousand, nine hundred eighty".