72664051 has 4 divisors (see below), whose sum is σ = 72803512. Its totient is φ = 72524592.

The previous prime is 72664019. The next prime is 72664073. The reversal of 72664051 is 15046627.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15046627 = 47 ⋅320141.

It is a cyclic number.

It is not a de Polignac number, because 72664051 - 2⁵ = 72664019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72694051) 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, 68946 + ... + 69991.

It is an arithmetic number, because the mean of its divisors is an integer number (18200878).

Almost surely, 2^72664051 is an apocalyptic number.

72664051 is a deficient number, since it is larger than the sum of its proper divisors (139461).

72664051 is a wasteful number, since it uses less digits than its factorization.

72664051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139460.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 72664051 is about 8524.3211459916. The cubic root of 72664051 is about 417.2918172768.

The spelling of 72664051 in words is "seventy-two million, six hundred sixty-four thousand, fifty-one".