72523380 has 48 divisors (see below), whose sum is σ = 213756480. Its totient is φ = 18321408.

The previous prime is 72523351. The next prime is 72523387. The reversal of 72523380 is 8332527.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72523387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30669 + ... + 32948.

It is an arithmetic number, because the mean of its divisors is an integer number (4453260).

Almost surely, 2^72523380 is an apocalyptic number.

It is an amenable number.

72523380 is an abundant number, since it is smaller than the sum of its proper divisors (141233100).

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

72523380 is a wasteful number, since it uses less digits than its factorization.

72523380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63648 (or 63646 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 72523380 is about 8516.0659931684. The cubic root of 72523380 is about 417.0223636426.

The spelling of 72523380 in words is "seventy-two million, five hundred twenty-three thousand, three hundred eighty".