77290881 has 8 divisors (see below), whose sum is σ = 103235424. Its totient is φ = 51436800.

The previous prime is 77290859. The next prime is 77290897. The reversal of 77290881 is 18809277.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77290881 - 2⁵ = 77290849 is a prime.

It is a super-2 number, since 2×77290881² = 11947760571512322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (77290831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20595 + ... + 24056.

It is an arithmetic number, because the mean of its divisors is an integer number (12904428).

Almost surely, 2^77290881 is an apocalyptic number.

It is an amenable number.

77290881 is a deficient number, since it is larger than the sum of its proper divisors (25944543).

77290881 is a wasteful number, since it uses less digits than its factorization.

77290881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45231.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 77290881 is about 8791.5232468555. The cubic root of 77290881 is about 425.9671281034.

The spelling of 77290881 in words is "seventy-seven million, two hundred ninety thousand, eight hundred eighty-one".