72458321 has 16 divisors (see below), whose sum is σ = 81019344. Its totient is φ = 64364544.

The previous prime is 72458299. The next prime is 72458329. The reversal of 72458321 is 12385427.

It can be written as a sum of positive squares in 8 ways, for example, as 3568321 + 68890000 = 1889^2 + 8300^2 .

It is not a de Polignac number, because 72458321 - 2²⁶ = 5349457 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72458329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45881 + ... + 47433.

It is an arithmetic number, because the mean of its divisors is an integer number (5063709).

Almost surely, 2^72458321 is an apocalyptic number.

It is an amenable number.

72458321 is a deficient number, since it is larger than the sum of its proper divisors (8561023).

72458321 is a wasteful number, since it uses less digits than its factorization.

72458321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700.

The product of its digits is 13440, while the sum is 32.

The square root of 72458321 is about 8512.2453559563. The cubic root of 72458321 is about 416.8976260528.

The spelling of 72458321 in words is "seventy-two million, four hundred fifty-eight thousand, three hundred twenty-one".