72764981 has 8 divisors (see below), whose sum is σ = 77298624. Its totient is φ = 68259520.

The previous prime is 72764969. The next prime is 72764983. The reversal of 72764981 is 18946727.

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

It is a cyclic number.

It is not a de Polignac number, because 72764981 - 2¹⁴ = 72748597 is a prime.

It is a super-2 number, since 2×72764981² = 10589484919860722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72764983) 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, 1595 + ... + 12168.

It is an arithmetic number, because the mean of its divisors is an integer number (9662328).

Almost surely, 2^72764981 is an apocalyptic number.

It is an amenable number.

72764981 is a deficient number, since it is larger than the sum of its proper divisors (4533643).

72764981 is a wasteful number, since it uses less digits than its factorization.

72764981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14091.

The product of its digits is 169344, while the sum is 44.

The square root of 72764981 is about 8530.2392111828. The cubic root of 72764981 is about 417.4849333012.

The spelling of 72764981 in words is "seventy-two million, seven hundred sixty-four thousand, nine hundred eighty-one".