72915223 has 4 divisors (see below), whose sum is σ = 73584280. Its totient is φ = 72246168.

The previous prime is 72915211. The next prime is 72915239. The reversal of 72915223 is 32251927.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72915223 - 2⁹ = 72914711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72913223) 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, 334365 + ... + 334582.

It is an arithmetic number, because the mean of its divisors is an integer number (18396070).

Almost surely, 2^72915223 is an apocalyptic number.

72915223 is a deficient number, since it is larger than the sum of its proper divisors (669057).

72915223 is a wasteful number, since it uses less digits than its factorization.

72915223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669056.

The product of its digits is 7560, while the sum is 31.

The square root of 72915223 is about 8539.0411054169. The cubic root of 72915223 is about 417.7720707408.

The spelling of 72915223 in words is "seventy-two million, nine hundred fifteen thousand, two hundred twenty-three".