72329721 has 8 divisors (see below), whose sum is σ = 96718944. Its totient is φ = 48080160.

The previous prime is 72329717. The next prime is 72329731. The reversal of 72329721 is 12792327.

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

It is not a de Polignac number, because 72329721 - 2² = 72329717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72329711) 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, 33700 + ... + 35781.

It is an arithmetic number, because the mean of its divisors is an integer number (12089868).

Almost surely, 2^72329721 is an apocalyptic number.

It is an amenable number.

72329721 is a deficient number, since it is larger than the sum of its proper divisors (24389223).

72329721 is a wasteful number, since it uses less digits than its factorization.

72329721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69831.

The product of its digits is 10584, while the sum is 33.

The square root of 72329721 is about 8504.6881777053. The cubic root of 72329721 is about 416.6508414967.

The spelling of 72329721 in words is "seventy-two million, three hundred twenty-nine thousand, seven hundred twenty-one".