72540522 has 40 divisors (see below), whose sum is σ = 163441476. Its totient is φ = 24046848.

The previous prime is 72540491. The next prime is 72540569. The reversal of 72540522 is 22504527.

72540522 is a `hidden beast` number, since 72 + 540 + 52 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 53012961 + 19527561 = 7281^2 + 4419^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30778 + ... + 33050.

Almost surely, 2^72540522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72540522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81720738).

72540522 is an abundant number, since it is smaller than the sum of its proper divisors (90900954).

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

72540522 is a wasteful number, since it uses less digits than its factorization.

72540522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484 (or 2475 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 72540522 is about 8517.0723843349. The cubic root of 72540522 is about 417.0552175728.

The spelling of 72540522 in words is "seventy-two million, five hundred forty thousand, five hundred twenty-two".