72000321 has 16 divisors (see below), whose sum is σ = 104928768. Its totient is φ = 43718400.

The previous prime is 72000289. The next prime is 72000343. The reversal of 72000321 is 12300027.

It is not a de Polignac number, because 72000321 - 2⁵ = 72000289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72000321.

It is not an unprimeable number, because it can be changed into a prime (72000371) 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, 21190 + ... + 24351.

It is an arithmetic number, because the mean of its divisors is an integer number (6558048).

Almost surely, 2^72000321 is an apocalyptic number.

It is an amenable number.

72000321 is a deficient number, since it is larger than the sum of its proper divisors (32928447).

72000321 is a wasteful number, since it uses less digits than its factorization.

72000321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45592.

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 72000321 is about 8485.3002893239. The cubic root of 72000321 is about 416.0173828566.

Adding to 72000321 its reverse (12300027), we get a palindrome (84300348).

The spelling of 72000321 in words is "seventy-two million, three hundred twenty-one", and thus it is an aban number.