78507013671428 has 6 divisors (see below), whose sum is σ = 137387273925006. Its totient is φ = 39253506835712.

The previous prime is 78507013671397. The next prime is 78507013671439. The reversal of 78507013671428 is 82417631070587.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 77652612933184 + 854400738244 = 8812072^2 + 924338^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9813376708925 + ... + 9813376708932.

It is an arithmetic number, because the mean of its divisors is an integer number (22897878987501).

Almost surely, 2^{78507013671428} is an apocalyptic number.

It is an amenable number.

78507013671428 is a deficient number, since it is larger than the sum of its proper divisors (58880260253578).

78507013671428 is a wasteful number, since it uses less digits than its factorization.

78507013671428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19626753417861 (or 19626753417859 counting only the distinct ones).

The product of its (nonzero) digits is 15805440, while the sum is 59.

The spelling of 78507013671428 in words is "seventy-eight trillion, five hundred seven billion, thirteen million, six hundred seventy-one thousand, four hundred twenty-eight".