72140321 has 12 divisors (see below), whose sum is σ = 83470800. Its totient is φ = 62128440.

The previous prime is 72140311. The next prime is 72140323. The reversal of 72140321 is 12304127.

It is a de Polignac number, because none of the positive numbers 2^k-72140321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72140293 and 72140302.

It is not an unprimeable number, because it can be changed into a prime (72140323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13391 + ... + 17988.

It is an arithmetic number, because the mean of its divisors is an integer number (6955900).

Almost surely, 2^72140321 is an apocalyptic number.

It is an amenable number.

72140321 is a deficient number, since it is larger than the sum of its proper divisors (11330479).

72140321 is a wasteful number, since it uses less digits than its factorization.

72140321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31420 (or 31409 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 72140321 is about 8493.5458437569. The cubic root of 72140321 is about 416.2868479736.

Adding to 72140321 its reverse (12304127), we get a palindrome (84444448).

The spelling of 72140321 in words is "seventy-two million, one hundred forty thousand, three hundred twenty-one".