72994521 has 8 divisors (see below), whose sum is σ = 99589600. Its totient is φ = 47531232.

The previous prime is 72994517. The next prime is 72994529. The reversal of 72994521 is 12549927.

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

It is not a de Polignac number, because 72994521 - 2² = 72994517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72994521.

It is not an unprimeable number, because it can be changed into a prime (72994529) 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, 282796 + ... + 283053.

It is an arithmetic number, because the mean of its divisors is an integer number (12448700).

Almost surely, 2^72994521 is an apocalyptic number.

It is an amenable number.

72994521 is a deficient number, since it is larger than the sum of its proper divisors (26595079).

72994521 is a wasteful number, since it uses less digits than its factorization.

72994521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565895.

The product of its digits is 45360, while the sum is 39.

The square root of 72994521 is about 8543.6831050783. The cubic root of 72994521 is about 417.9234633950.

The spelling of 72994521 in words is "seventy-two million, nine hundred ninety-four thousand, five hundred twenty-one".