77712648 has 32 divisors (see below), whose sum is σ = 209227200. Its totient is φ = 23911488.

The previous prime is 77712637. The next prime is 77712659. The reversal of 77712648 is 84621777.

It is an interprime number because it is at equal distance from previous prime (77712637) and next prime (77712659).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124228 + ... + 124851.

It is an arithmetic number, because the mean of its divisors is an integer number (6538350).

Almost surely, 2^77712648 is an apocalyptic number.

77712648 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

77712648 is an abundant number, since it is smaller than the sum of its proper divisors (131514552).

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

77712648 is a wasteful number, since it uses less digits than its factorization.

77712648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249101 (or 249097 counting only the distinct ones).

The product of its digits is 131712, while the sum is 42.

The square root of 77712648 is about 8815.4777522265. The cubic root of 77712648 is about 426.7405400517.

The spelling of 77712648 in words is "seventy-seven million, seven hundred twelve thousand, six hundred forty-eight".