72275321 has 4 divisors (see below), whose sum is σ = 73146192. Its totient is φ = 71404452.

The previous prime is 72275317. The next prime is 72275327. The reversal of 72275321 is 12357227.

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: 12357227 = 127 ⋅97301.

It is a cyclic number.

It is not a de Polignac number, because 72275321 - 2² = 72275317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72275327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435311 + ... + 435476.

It is an arithmetic number, because the mean of its divisors is an integer number (18286548).

Almost surely, 2^72275321 is an apocalyptic number.

It is an amenable number.

72275321 is a deficient number, since it is larger than the sum of its proper divisors (870871).

72275321 is an equidigital number, since it uses as much as digits as its factorization.

72275321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870870.

The product of its digits is 5880, while the sum is 29.

The square root of 72275321 is about 8501.4893401098. The cubic root of 72275321 is about 416.5463593639.

The spelling of 72275321 in words is "seventy-two million, two hundred seventy-five thousand, three hundred twenty-one".