72379961 has 4 divisors (see below), whose sum is σ = 73606800. Its totient is φ = 71153124.

The previous prime is 72379939. The next prime is 72379981. The reversal of 72379961 is 16997327.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-72379961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72379921) 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, 613331 + ... + 613448.

It is an arithmetic number, because the mean of its divisors is an integer number (18401700).

Almost surely, 2^72379961 is an apocalyptic number.

It is an amenable number.

72379961 is a deficient number, since it is larger than the sum of its proper divisors (1226839).

72379961 is a wasteful number, since it uses less digits than its factorization.

72379961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226838.

The product of its digits is 142884, while the sum is 44.

The square root of 72379961 is about 8507.6413300045. The cubic root of 72379961 is about 416.7472872975.

The spelling of 72379961 in words is "seventy-two million, three hundred seventy-nine thousand, nine hundred sixty-one".