72262661 has 4 divisors (see below), whose sum is σ = 73943232. Its totient is φ = 70582092.

The previous prime is 72262657. The next prime is 72262703. The reversal of 72262661 is 16626227.

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: 16626227 = 3823 ⋅4349.

It is not a de Polignac number, because 72262661 - 2² = 72262657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72262601) 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, 840221 + ... + 840306.

It is an arithmetic number, because the mean of its divisors is an integer number (18485808).

Almost surely, 2^72262661 is an apocalyptic number.

It is an amenable number.

72262661 is a deficient number, since it is larger than the sum of its proper divisors (1680571).

72262661 is a wasteful number, since it uses less digits than its factorization.

72262661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680570.

The product of its digits is 12096, while the sum is 32.

The square root of 72262661 is about 8500.7447320808. The cubic root of 72262661 is about 416.5220367008.

Adding to 72262661 its reverse (16626227), we get a palindrome (88888888).

The spelling of 72262661 in words is "seventy-two million, two hundred sixty-two thousand, six hundred sixty-one".