72375721 has 8 divisors (see below), whose sum is σ = 79041024. Its totient is φ = 65724720.

The previous prime is 72375683. The next prime is 72375739. The reversal of 72375721 is 12757327.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72375721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72375781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8931 + ... + 14983.

It is an arithmetic number, because the mean of its divisors is an integer number (9880128).

Almost surely, 2^72375721 is an apocalyptic number.

It is an amenable number.

72375721 is a deficient number, since it is larger than the sum of its proper divisors (6665303).

72375721 is a wasteful number, since it uses less digits than its factorization.

72375721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7151.

The product of its digits is 20580, while the sum is 34.

The square root of 72375721 is about 8507.3921386051. The cubic root of 72375721 is about 416.7391494880.

The spelling of 72375721 in words is "seventy-two million, three hundred seventy-five thousand, seven hundred twenty-one".