77712980 has 24 divisors (see below), whose sum is σ = 163478112. Its totient is φ = 31031712.

The previous prime is 77712977. The next prime is 77712989. The reversal of 77712980 is 8921777.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77712989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9839 + ... + 15881.

It is an arithmetic number, because the mean of its divisors is an integer number (6811588).

Almost surely, 2^77712980 is an apocalyptic number.

It is an amenable number.

77712980 is an abundant number, since it is smaller than the sum of its proper divisors (85765132).

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

77712980 is a wasteful number, since it uses less digits than its factorization.

77712980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6695 (or 6693 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 41.

The square root of 77712980 is about 8815.4965827229. The cubic root of 77712980 is about 426.7411477505.

The spelling of 77712980 in words is "seventy-seven million, seven hundred twelve thousand, nine hundred eighty".