72574321 has 2 divisors, whose sum is σ = 72574322. Its totient is φ = 72574320.

The previous prime is 72574289. The next prime is 72574351. The reversal of 72574321 is 12347527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65610000 + 6964321 = 8100^2 + 2639^2 .

It is a cyclic number.

It is not a de Polignac number, because 72574321 - 2⁵ = 72574289 is a prime.

It is a super-2 number, since 2×72574321² = 10534064137222082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72574351) 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 as a sum of consecutive naturals, namely, 36287160 + 36287161.

It is an arithmetic number, because the mean of its divisors is an integer number (36287161).

Almost surely, 2^72574321 is an apocalyptic number.

It is an amenable number.

72574321 is a deficient number, since it is larger than the sum of its proper divisors (1).

72574321 is an equidigital number, since it uses as much as digits as its factorization.

72574321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 31.

The square root of 72574321 is about 8519.0563444551. The cubic root of 72574321 is about 417.1199807342.

The spelling of 72574321 in words is "seventy-two million, five hundred seventy-four thousand, three hundred twenty-one".