72905686 has 8 divisors (see below), whose sum is σ = 124981200. Its totient is φ = 31245288.

The previous prime is 72905671. The next prime is 72905689. The reversal of 72905686 is 68650927.

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

It is a super-2 number, since 2×72905686² = 10630478102261192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72905689) 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, 2603761 + ... + 2603788.

It is an arithmetic number, because the mean of its divisors is an integer number (15622650).

Almost surely, 2^72905686 is an apocalyptic number.

72905686 is a deficient number, since it is larger than the sum of its proper divisors (52075514).

72905686 is a wasteful number, since it uses less digits than its factorization.

72905686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5207558.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 72905686 is about 8538.4826520875. The cubic root of 72905686 is about 417.7538556786.

The spelling of 72905686 in words is "seventy-two million, nine hundred five thousand, six hundred eighty-six".