72021752 has 16 divisors (see below), whose sum is σ = 147317400. Its totient is φ = 32737120.

The previous prime is 72021743. The next prime is 72021757. The reversal of 72021752 is 25712027.

It is a super-2 number, since 2×72021752² = 10374265522299008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72021757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409127 + ... + 409302.

Almost surely, 2^72021752 is an apocalyptic number.

It is an amenable number.

72021752 is an abundant number, since it is smaller than the sum of its proper divisors (75295648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72021752 is a wasteful number, since it uses less digits than its factorization.

72021752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818446 (or 818442 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 72021752 is about 8486.5630263376. The cubic root of 72021752 is about 416.0586548212.

Adding to 72021752 its reverse (25712027), we get a palindrome (97733779).

The spelling of 72021752 in words is "seventy-two million, twenty-one thousand, seven hundred fifty-two".