72700321 has 4 divisors (see below), whose sum is σ = 72798912. Its totient is φ = 72601732.

The previous prime is 72700319. The next prime is 72700333. The reversal of 72700321 is 12300727.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12300727 = 29 ⋅424163.

It is a cyclic number.

It is not a de Polignac number, because 72700321 - 2¹ = 72700319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72700292 and 72700301.

It is not an unprimeable number, because it can be changed into a prime (72740321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48181 + ... + 49666.

It is an arithmetic number, because the mean of its divisors is an integer number (18199728).

Almost surely, 2^72700321 is an apocalyptic number.

It is an amenable number.

72700321 is a deficient number, since it is larger than the sum of its proper divisors (98591).

72700321 is an equidigital number, since it uses as much as digits as its factorization.

72700321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98590.

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 72700321 is about 8526.4483227191. The cubic root of 72700321 is about 417.3612356319.

The spelling of 72700321 in words is "seventy-two million, seven hundred thousand, three hundred twenty-one".