72693916578 has 12 divisors (see below), whose sum is σ = 157503485958. Its totient is φ = 24231305520.

The previous prime is 72693916553. The next prime is 72693916583. The reversal of 72693916578 is 87561939627.

72693916578 is a `hidden beast` number, since 7 + 26 + 9 + 39 + 1 + 6 + 578 = 666.

It can be written as a sum of positive squares in only one way, i.e., 60650390529 + 12043526049 = 246273^2 + 109743^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2019275443 + ... + 2019275478.

Almost surely, 2^72693916578 is an apocalyptic number.

72693916578 is an abundant number, since it is smaller than the sum of its proper divisors (84809569380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72693916578 is a wasteful number, since it uses less digits than its factorization.

72693916578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4038550929 (or 4038550926 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 63.

The spelling of 72693916578 in words is "seventy-two billion, six hundred ninety-three million, nine hundred sixteen thousand, five hundred seventy-eight".