72491297 has 6 divisors (see below), whose sum is σ = 73212642. Its totient is φ = 71776992.

The previous prime is 72491273. The next prime is 72491311. The reversal of 72491297 is 79219427.

It can be written as a sum of positive squares in only one way, i.e., 49056016 + 23435281 = 7004^2 + 4841^2 .

It is not a de Polignac number, because 72491297 - 2¹⁸ = 72229153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72491207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7193 + ... + 14025.

It is an arithmetic number, because the mean of its divisors is an integer number (12202107).

Almost surely, 2^72491297 is an apocalyptic number.

It is an amenable number.

72491297 is a deficient number, since it is larger than the sum of its proper divisors (721345).

72491297 is an equidigital number, since it uses as much as digits as its factorization.

72491297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7039 (or 6936 counting only the distinct ones).

The product of its digits is 63504, while the sum is 41.

The square root of 72491297 is about 8514.1821098682. The cubic root of 72491297 is about 416.9608602492.

The spelling of 72491297 in words is "seventy-two million, four hundred ninety-one thousand, two hundred ninety-seven".