72730125178 has 4 divisors (see below), whose sum is σ = 109095187770. Its totient is φ = 36365062588.

The previous prime is 72730125151. The next prime is 72730125199. The reversal of 72730125178 is 87152103727.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 65683026369 + 7047098809 = 256287^2 + 83947^2 .

It is a super-2 number, since 2×72730125178² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18182531293 + ... + 18182531296.

Almost surely, 2^72730125178 is an apocalyptic number.

72730125178 is a deficient number, since it is larger than the sum of its proper divisors (36365062592).

72730125178 is a wasteful number, since it uses less digits than its factorization.

72730125178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36365062591.

The product of its (nonzero) digits is 164640, while the sum is 43.

The spelling of 72730125178 in words is "seventy-two billion, seven hundred thirty million, one hundred twenty-five thousand, one hundred seventy-eight".