77985715970 has 16 divisors (see below), whose sum is σ = 142469428608. Its totient is φ = 30728699760.

The previous prime is 77985715957. The next prime is 77985715987. The reversal of 77985715970 is 7951758977.

It is a junction number, because it is equal to n+sod(n) for n = 77985715897 and 77985715906.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58197626 + ... + 58198965.

It is an arithmetic number, because the mean of its divisors is an integer number (8904339288).

Almost surely, 2^77985715970 is an apocalyptic number.

77985715970 is a deficient number, since it is larger than the sum of its proper divisors (64483712638).

77985715970 is a wasteful number, since it uses less digits than its factorization.

77985715970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116396665.

The product of its (nonzero) digits is 38896200, while the sum is 65.

The spelling of 77985715970 in words is "seventy-seven billion, nine hundred eighty-five million, seven hundred fifteen thousand, nine hundred seventy".