72780056 has 16 divisors (see below), whose sum is σ = 136663200. Its totient is φ = 36336544.

The previous prime is 72780047. The next prime is 72780079. The reversal of 72780056 is 65008727.

It is a junction number, because it is equal to n+sod(n) for n = 72779998 and 72780025.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575 + ... + 12078.

It is an arithmetic number, because the mean of its divisors is an integer number (8541450).

Almost surely, 2^72780056 is an apocalyptic number.

It is an amenable number.

72780056 is a deficient number, since it is larger than the sum of its proper divisors (63883144).

72780056 is a wasteful number, since it uses less digits than its factorization.

72780056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13378 (or 13374 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 72780056 is about 8531.1227865973. The cubic root of 72780056 is about 417.5137619617.

The spelling of 72780056 in words is "seventy-two million, seven hundred eighty thousand, fifty-six".