78512179738 has 12 divisors (see below), whose sum is σ = 125103318462. Its totient is φ = 36946907840.

The previous prime is 78512179727. The next prime is 78512179741. The reversal of 78512179738 is 83797121587.

It can be written as a sum of positive squares in 3 ways, for example, as 64326655129 + 14185524609 = 253627^2 + 119103^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67916533 + ... + 67917688.

Almost surely, 2^78512179738 is an apocalyptic number.

78512179738 is a deficient number, since it is larger than the sum of its proper divisors (46591138724).

78512179738 is a wasteful number, since it uses less digits than its factorization.

78512179738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135834257 (or 135834240 counting only the distinct ones).

The product of its digits is 5927040, while the sum is 58.

The spelling of 78512179738 in words is "seventy-eight billion, five hundred twelve million, one hundred seventy-nine thousand, seven hundred thirty-eight".