72919641 has 4 divisors (see below), whose sum is σ = 97226192. Its totient is φ = 48613092.

The previous prime is 72919633. The next prime is 72919661. The reversal of 72919641 is 14691927.

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 not a de Polignac number, because 72919641 - 2³ = 72919633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72919641.

It is not an unprimeable number, because it can be changed into a prime (72919661) 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, 12153271 + ... + 12153276.

It is an arithmetic number, because the mean of its divisors is an integer number (24306548).

Almost surely, 2^72919641 is an apocalyptic number.

It is an amenable number.

72919641 is a deficient number, since it is larger than the sum of its proper divisors (24306551).

72919641 is a wasteful number, since it uses less digits than its factorization.

72919641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24306550.

The product of its digits is 27216, while the sum is 39.

The square root of 72919641 is about 8539.2997956507. The cubic root of 72919641 is about 417.7805083009.

The spelling of 72919641 in words is "seventy-two million, nine hundred nineteen thousand, six hundred forty-one".