77905613862 has 48 divisors (see below), whose sum is σ = 181083324240. Its totient is φ = 25073066592.

The previous prime is 77905613861. The next prime is 77905613867. The reversal of 77905613862 is 26831650977.

77905613862 is a `hidden beast` number, since 7 + 79 + 0 + 561 + 3 + 8 + 6 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 77905613799 and 77905613808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77905613861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2749693 + ... + 2777880.

It is an arithmetic number, because the mean of its divisors is an integer number (3772569255).

Almost surely, 2^77905613862 is an apocalyptic number.

77905613862 is an abundant number, since it is smaller than the sum of its proper divisors (103177710378).

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

77905613862 is a wasteful number, since it uses less digits than its factorization.

77905613862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5527619 (or 5527607 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 77905613862 in words is "seventy-seven billion, nine hundred five million, six hundred thirteen thousand, eight hundred sixty-two".