72866381 has 12 divisors (see below), whose sum is σ = 86736672. Its totient is φ = 61002648.

The previous prime is 72866371. The next prime is 72866407. The reversal of 72866381 is 18366827.

It is a happy number.

It is not a de Polignac number, because 72866381 - 2⁶ = 72866317 is a prime.

It is a super-2 number, since 2×72866381² = 10619018960074322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72866341) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15185 + ... + 19398.

It is an arithmetic number, because the mean of its divisors is an integer number (7228056).

Almost surely, 2^72866381 is an apocalyptic number.

It is an amenable number.

72866381 is a deficient number, since it is larger than the sum of its proper divisors (13870291).

72866381 is a wasteful number, since it uses less digits than its factorization.

72866381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34640 (or 34633 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 72866381 is about 8536.1807033357. The cubic root of 72866381 is about 417.6787688652.

The spelling of 72866381 in words is "seventy-two million, eight hundred sixty-six thousand, three hundred eighty-one".