77908871 has 4 divisors (see below), whose sum is σ = 78072000. Its totient is φ = 77745744.

The previous prime is 77908861. The next prime is 77908913. The reversal of 77908871 is 17880977.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77908871 - 2¹⁸ = 77646727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77908801) 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 3 ways as a sum of consecutive naturals, for example, 80846 + ... + 81803.

It is an arithmetic number, because the mean of its divisors is an integer number (19518000).

Almost surely, 2^77908871 is an apocalyptic number.

77908871 is a deficient number, since it is larger than the sum of its proper divisors (163129).

77908871 is a wasteful number, since it uses less digits than its factorization.

77908871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163128.

The product of its (nonzero) digits is 197568, while the sum is 47.

The square root of 77908871 is about 8826.6001948655. The cubic root of 77908871 is about 427.0994088343.

It can be divided in two parts, 7790 and 8871, that added together give a palindrome (16661).

The spelling of 77908871 in words is "seventy-seven million, nine hundred eight thousand, eight hundred seventy-one".