72544140 has 48 divisors (see below), whose sum is σ = 225694560. Its totient is φ = 19344960.

The previous prime is 72544127. The next prime is 72544201. The reversal of 72544140 is 4144527.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66631 + ... + 67710.

It is an arithmetic number, because the mean of its divisors is an integer number (4701970).

Almost surely, 2^72544140 is an apocalyptic number.

It is an amenable number.

72544140 is an abundant number, since it is smaller than the sum of its proper divisors (153150420).

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

72544140 is a wasteful number, since it uses less digits than its factorization.

72544140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134359 (or 134351 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 72544140 is about 8517.2847786134. The cubic root of 72544140 is about 417.0621510800.

Adding to 72544140 its reverse (4144527), we get a palindrome (76688667).

The spelling of 72544140 in words is "seventy-two million, five hundred forty-four thousand, one hundred forty".