72090997 has 32 divisors (see below), whose sum is σ = 87091200. Its totient is φ = 58953600.

The previous prime is 72090983. The next prime is 72091009. The reversal of 72090997 is 79909027.

It is a cyclic number.

It is not a de Polignac number, because 72090997 - 2⁷ = 72090869 is a prime.

It is a super-2 number, since 2×72090997² = 10394223696908018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72090797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 402654 + ... + 402832.

It is an arithmetic number, because the mean of its divisors is an integer number (2721600).

Almost surely, 2^72090997 is an apocalyptic number.

It is an amenable number.

72090997 is a deficient number, since it is larger than the sum of its proper divisors (15000203).

72090997 is a wasteful number, since it uses less digits than its factorization.

72090997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297.

The product of its (nonzero) digits is 71442, while the sum is 43.

The square root of 72090997 is about 8490.6417307527. The cubic root of 72090997 is about 416.1919513721.

The spelling of 72090997 in words is "seventy-two million, ninety thousand, nine hundred ninety-seven".