72222997 has 16 divisors (see below), whose sum is σ = 90288000. Its totient is φ = 56125440.

The previous prime is 72222989. The next prime is 72223007. The reversal of 72222997 is 79922227.

It is not a de Polignac number, because 72222997 - 2³ = 72222989 is a prime.

It is a super-2 number, since 2×72222997² = 10432322591324018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72222937) 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, 33529 + ... + 35617.

It is an arithmetic number, because the mean of its divisors is an integer number (5643000).

Almost surely, 2^72222997 is an apocalyptic number.

72222997 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

72222997 is a deficient number, since it is larger than the sum of its proper divisors (18065003).

72222997 is a wasteful number, since it uses less digits than its factorization.

72222997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2556.

The product of its digits is 63504, while the sum is 40.

The square root of 72222997 is about 8498.4114397927. The cubic root of 72222997 is about 416.4458149773.

The spelling of 72222997 in words is "seventy-two million, two hundred twenty-two thousand, nine hundred ninety-seven".