72531866 has 8 divisors (see below), whose sum is σ = 118688544. Its totient is φ = 32969020.

The previous prime is 72531863. The next prime is 72531869. The reversal of 72531866 is 66813527.

It is an interprime number because it is at equal distance from previous prime (72531863) and next prime (72531869).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (72531863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1648430 + ... + 1648473.

It is an arithmetic number, because the mean of its divisors is an integer number (14836068).

Almost surely, 2^72531866 is an apocalyptic number.

72531866 is a deficient number, since it is larger than the sum of its proper divisors (46156678).

72531866 is a wasteful number, since it uses less digits than its factorization.

72531866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3296916.

The product of its digits is 60480, while the sum is 38.

The square root of 72531866 is about 8516.5642133433. The cubic root of 72531866 is about 417.0386283458.

It can be divided in two parts, 7253 and 1866, that added together give a palindrome (9119).

The spelling of 72531866 in words is "seventy-two million, five hundred thirty-one thousand, eight hundred sixty-six".