72153720 has 64 divisors (see below), whose sum is σ = 240516000. Its totient is φ = 19240704.

The previous prime is 72153703. The next prime is 72153721. The reversal of 72153720 is 2735127.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72153721) 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, 32325 + ... + 34484.

Almost surely, 2^72153720 is an apocalyptic number.

It is an amenable number.

72153720 is an abundant number, since it is smaller than the sum of its proper divisors (168362280).

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

72153720 is a wasteful number, since it uses less digits than its factorization.

72153720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66829 (or 66819 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 72153720 is about 8494.3345825321. The cubic root of 72153720 is about 416.3126194243.

Adding to 72153720 its reverse (2735127), we get a palindrome (74888847).

The spelling of 72153720 in words is "seventy-two million, one hundred fifty-three thousand, seven hundred twenty".