72370321 has 8 divisors (see below), whose sum is σ = 72892904. Its totient is φ = 71850240.

The previous prime is 72370301. The next prime is 72370327. The reversal of 72370321 is 12307327.

It can be written as a sum of positive squares in 4 ways, for example, as 731025 + 71639296 = 855^2 + 8464^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72370321 - 2²³ = 63981713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72370327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166921 + ... + 167353.

It is an arithmetic number, because the mean of its divisors is an integer number (9111613).

Almost surely, 2^72370321 is an apocalyptic number.

It is an amenable number.

72370321 is a deficient number, since it is larger than the sum of its proper divisors (522583).

72370321 is a wasteful number, since it uses less digits than its factorization.

72370321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251.

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 72370321 is about 8507.0747616322. The cubic root of 72370321 is about 416.7287848365.

Adding to 72370321 its reverse (12307327), we get a palindrome (84677648).

The spelling of 72370321 in words is "seventy-two million, three hundred seventy thousand, three hundred twenty-one".