77616855 has 12 divisors (see below), whose sum is σ = 134535960. Its totient is φ = 41395632.

The previous prime is 77616853. The next prime is 77616859. The reversal of 77616855 is 55861677.

It is not a de Polignac number, because 77616855 - 2¹ = 77616853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1724819 = 77616855 / (7 + 7 + 6 + 1 + 6 + 8 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 77616855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77616853) 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 11 ways as a sum of consecutive naturals, for example, 862365 + ... + 862454.

It is an arithmetic number, because the mean of its divisors is an integer number (11211330).

Almost surely, 2^77616855 is an apocalyptic number.

77616855 is a deficient number, since it is larger than the sum of its proper divisors (56919105).

77616855 is a wasteful number, since it uses less digits than its factorization.

77616855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724830 (or 1724827 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 77616855 is about 8810.0428489310. The cubic root of 77616855 is about 426.5651264581.

The spelling of 77616855 in words is "seventy-seven million, six hundred sixteen thousand, eight hundred fifty-five".