72187797 has 16 divisors (see below), whose sum is σ = 111177792. Its totient is φ = 41176320.

The previous prime is 72187793. The next prime is 72187807. The reversal of 72187797 is 79778127.

It is not a de Polignac number, because 72187797 - 2² = 72187793 is a prime.

It is a super-2 number, since 2×72187797² = 10422156071426418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72187793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63778 + ... + 64899.

It is an arithmetic number, because the mean of its divisors is an integer number (6948612).

Almost surely, 2^72187797 is an apocalyptic number.

It is an amenable number.

72187797 is a deficient number, since it is larger than the sum of its proper divisors (38989995).

72187797 is a wasteful number, since it uses less digits than its factorization.

72187797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128708.

The product of its digits is 345744, while the sum is 48.

The square root of 72187797 is about 8496.3402121149. The cubic root of 72187797 is about 416.3781482810.

The spelling of 72187797 in words is "seventy-two million, one hundred eighty-seven thousand, seven hundred ninety-seven".