72452821 has 12 divisors (see below), whose sum is σ = 84427488. Its totient is φ = 61995192.

The previous prime is 72452819. The next prime is 72452843. The reversal of 72452821 is 12825427.

It is a happy number.

It is not a de Polignac number, because 72452821 - 2¹ = 72452819 is a prime.

It is a super-2 number, since 2×72452821² = 10498822541716082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72452801) 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, 42630 + ... + 44296.

It is an arithmetic number, because the mean of its divisors is an integer number (7035624).

Almost surely, 2^72452821 is an apocalyptic number.

It is an amenable number.

72452821 is a deficient number, since it is larger than the sum of its proper divisors (11974667).

72452821 is a wasteful number, since it uses less digits than its factorization.

72452821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2568 (or 2561 counting only the distinct ones).

The product of its digits is 8960, while the sum is 31.

The square root of 72452821 is about 8511.9222858294. The cubic root of 72452821 is about 416.8870774830.

The spelling of 72452821 in words is "seventy-two million, four hundred fifty-two thousand, eight hundred twenty-one".