72292661 has 4 divisors (see below), whose sum is σ = 82620192. Its totient is φ = 61965132.

The previous prime is 72292643. The next prime is 72292699. The reversal of 72292661 is 16629227.

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.

It is a cyclic number.

It is not a de Polignac number, because 72292661 - 2²² = 68098357 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 (72292601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5163755 + ... + 5163768.

It is an arithmetic number, because the mean of its divisors is an integer number (20655048).

Almost surely, 2^72292661 is an apocalyptic number.

It is an amenable number.

72292661 is a deficient number, since it is larger than the sum of its proper divisors (10327531).

72292661 is a wasteful number, since it uses less digits than its factorization.

72292661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10327530.

The product of its digits is 18144, while the sum is 35.

The square root of 72292661 is about 8502.5091002598. The cubic root of 72292661 is about 416.5796687343.

The spelling of 72292661 in words is "seventy-two million, two hundred ninety-two thousand, six hundred sixty-one".