72662721 has 8 divisors (see below), whose sum is σ = 97110144. Its totient is φ = 48328560.

The previous prime is 72662717. The next prime is 72662741. The reversal of 72662721 is 12726627.

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

It is not a de Polignac number, because 72662721 - 2² = 72662717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72662741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26806 + ... + 29391.

It is an arithmetic number, because the mean of its divisors is an integer number (12138768).

Almost surely, 2^72662721 is an apocalyptic number.

It is an amenable number.

72662721 is a deficient number, since it is larger than the sum of its proper divisors (24447423).

72662721 is a wasteful number, since it uses less digits than its factorization.

72662721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56631.

The product of its digits is 14112, while the sum is 33.

The square root of 72662721 is about 8524.2431335574. The cubic root of 72662721 is about 417.2892713067.

The spelling of 72662721 in words is "seventy-two million, six hundred sixty-two thousand, seven hundred twenty-one".