72897797 has 4 divisors (see below), whose sum is σ = 83311776. Its totient is φ = 62483820.

The previous prime is 72897791. The next prime is 72897823. The reversal of 72897797 is 79779827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79779827 = 17 ⋅4692931.

It is not a de Polignac number, because 72897797 - 2²² = 68703493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72897791) 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, 5206979 + ... + 5206992.

It is an arithmetic number, because the mean of its divisors is an integer number (20827944).

Almost surely, 2^72897797 is an apocalyptic number.

It is an amenable number.

72897797 is a deficient number, since it is larger than the sum of its proper divisors (10413979).

72897797 is a wasteful number, since it uses less digits than its factorization.

72897797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10413978.

The product of its digits is 3111696, while the sum is 56.

The square root of 72897797 is about 8538.0206722636. The cubic root of 72897797 is about 417.7387869909.

The spelling of 72897797 in words is "seventy-two million, eight hundred ninety-seven thousand, seven hundred ninety-seven".