72944381 has 4 divisors (see below), whose sum is σ = 72979200. Its totient is φ = 72909564.

The previous prime is 72944369. The next prime is 72944387. The reversal of 72944381 is 18344927.

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 72944381 - 2⁶ = 72944317 is a prime.

It is a super-2 number, since 2×72944381² = 10641765438946322, 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 (72944387) 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, 14051 + ... + 18528.

It is an arithmetic number, because the mean of its divisors is an integer number (18244800).

Almost surely, 2^72944381 is an apocalyptic number.

It is an amenable number.

72944381 is a deficient number, since it is larger than the sum of its proper divisors (34819).

72944381 is a wasteful number, since it uses less digits than its factorization.

72944381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34818.

The product of its digits is 48384, while the sum is 38.

The square root of 72944381 is about 8540.7482693263. The cubic root of 72944381 is about 417.8277508131.

The spelling of 72944381 in words is "seventy-two million, nine hundred forty-four thousand, three hundred eighty-one".