72491123 has 8 divisors (see below), whose sum is σ = 73692000. Its totient is φ = 71299008.

The previous prime is 72491087. The next prime is 72491143. The reversal of 72491123 is 32119427.

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 72491123 - 2¹⁸ = 72228979 is a prime.

It is a super-2 number, since 2×72491123² = 10509925827602258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72491143) 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, 15665 + ... + 19757.

It is an arithmetic number, because the mean of its divisors is an integer number (9211500).

Almost surely, 2^72491123 is an apocalyptic number.

72491123 is a deficient number, since it is larger than the sum of its proper divisors (1200877).

72491123 is a wasteful number, since it uses less digits than its factorization.

72491123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4381.

The product of its digits is 3024, while the sum is 29.

The square root of 72491123 is about 8514.1718916169. The cubic root of 72491123 is about 416.9605266402.

The spelling of 72491123 in words is "seventy-two million, four hundred ninety-one thousand, one hundred twenty-three".