72232821 has 24 divisors (see below), whose sum is σ = 108326400. Its totient is φ = 46332000.

The previous prime is 72232763. The next prime is 72232829. The reversal of 72232821 is 12823227.

It is a happy number.

It is not a de Polignac number, because 72232821 - 2⁶ = 72232757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72232829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54871 + ... + 56171.

It is an arithmetic number, because the mean of its divisors is an integer number (4513600).

Almost surely, 2^72232821 is an apocalyptic number.

It is an amenable number.

72232821 is a deficient number, since it is larger than the sum of its proper divisors (36093579).

72232821 is a wasteful number, since it uses less digits than its factorization.

72232821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537 (or 1534 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 72232821 is about 8498.9894105123. The cubic root of 72232821 is about 416.4646962126.

The spelling of 72232821 in words is "seventy-two million, two hundred thirty-two thousand, eight hundred twenty-one".