72866385 has 20 divisors (see below), whose sum is σ = 130620468. Its totient is φ = 38861856.

The previous prime is 72866371. The next prime is 72866407. The reversal of 72866385 is 58366827.

72866385 is a `hidden beast` number, since 7 + 2 + 8 + 6 + 638 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 48274704 + 24591681 = 6948^2 + 4959^2 .

It is not a de Polignac number, because 72866385 - 2⁷ = 72866257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 72866385.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 89554 + ... + 90363.

Almost surely, 2^72866385 is an apocalyptic number.

It is an amenable number.

72866385 is a deficient number, since it is larger than the sum of its proper divisors (57754083).

72866385 is a wasteful number, since it uses less digits than its factorization.

72866385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179934 (or 179925 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 72866385 is about 8536.1809376325. The cubic root of 72866385 is about 417.6787765080.

The spelling of 72866385 in words is "seventy-two million, eight hundred sixty-six thousand, three hundred eighty-five".