77656488 has 192 divisors, whose sum is σ = 253572480. Its totient is φ = 19284480.

The previous prime is 77656483. The next prime is 77656499. The reversal of 77656488 is 88465677.

Its product of digits (2257920) is a multiple of the sum of its prime factors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 77656488.

It is not an unprimeable number, because it can be changed into a prime (77656483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2098806 + ... + 2098842.

It is an arithmetic number, because the mean of its divisors is an integer number (1320690).

Almost surely, 2^77656488 is an apocalyptic number.

77656488 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77656488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126786240).

77656488 is an abundant number, since it is smaller than the sum of its proper divisors (175915992).

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

77656488 is a wasteful number, since it uses less digits than its factorization.

77656488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 93 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 51.

The square root of 77656488 is about 8812.2918698827. The cubic root of 77656488 is about 426.6377188477.

The spelling of 77656488 in words is "seventy-seven million, six hundred fifty-six thousand, four hundred eighty-eight".