77907400785 has 96 divisors (see below), whose sum is σ = 150418944000. Its totient is φ = 37121293440.

The previous prime is 77907400763. The next prime is 77907400859. The reversal of 77907400785 is 58700470977.

77907400785 is a `hidden beast` number, since 77 + 90 + 7 + 400 + 7 + 85 = 666.

It is not a de Polignac number, because 77907400785 - 2¹⁰ = 77907399761 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1368316 + ... + 1424114.

It is an arithmetic number, because the mean of its divisors is an integer number (1566864000).

Almost surely, 2^77907400785 is an apocalyptic number.

It is an amenable number.

77907400785 is a deficient number, since it is larger than the sum of its proper divisors (72511543215).

77907400785 is a wasteful number, since it uses less digits than its factorization.

77907400785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55923 (or 55920 counting only the distinct ones).

The product of its (nonzero) digits is 3457440, while the sum is 54.

The spelling of 77907400785 in words is "seventy-seven billion, nine hundred seven million, four hundred thousand, seven hundred eighty-five".