72686491 has 8 divisors (see below), whose sum is σ = 74468160. Its totient is φ = 70925448.

The previous prime is 72686483. The next prime is 72686501. The reversal of 72686491 is 19468627.

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

It is a cyclic number.

It is not a de Polignac number, because 72686491 - 2³ = 72686483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72686401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2100 + ... + 12238.

It is an arithmetic number, because the mean of its divisors is an integer number (9308520).

Almost surely, 2^72686491 is an apocalyptic number.

72686491 is a deficient number, since it is larger than the sum of its proper divisors (1781669).

72686491 is a wasteful number, since it uses less digits than its factorization.

72686491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10313.

The product of its digits is 145152, while the sum is 43.

The square root of 72686491 is about 8525.6372782332. The cubic root of 72686491 is about 417.3347686605.

The spelling of 72686491 in words is "seventy-two million, six hundred eighty-six thousand, four hundred ninety-one".