72989321 has 4 divisors (see below), whose sum is σ = 74366532. Its totient is φ = 71612112.

The previous prime is 72989311. The next prime is 72989333. The reversal of 72989321 is 12398927.

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: 12398927 = 2767 ⋅4481.

It can be written as a sum of positive squares in 2 ways, for example, as 49843600 + 23145721 = 7060^2 + 4811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72989321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72989311) 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 3 ways as a sum of consecutive naturals, for example, 688526 + ... + 688631.

It is an arithmetic number, because the mean of its divisors is an integer number (18591633).

Almost surely, 2^72989321 is an apocalyptic number.

It is an amenable number.

72989321 is a deficient number, since it is larger than the sum of its proper divisors (1377211).

72989321 is a wasteful number, since it uses less digits than its factorization.

72989321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377210.

The product of its digits is 54432, while the sum is 41.

The square root of 72989321 is about 8543.3787812551. The cubic root of 72989321 is about 417.9135391177.

The spelling of 72989321 in words is "seventy-two million, nine hundred eighty-nine thousand, three hundred twenty-one".