72540549 has 16 divisors (see below), whose sum is σ = 107634240. Its totient is φ = 48285360.

The previous prime is 72540491. The next prime is 72540569. The reversal of 72540549 is 94504527.

72540549 is a `hidden beast` number, since 72 + 5 + 40 + 549 = 666.

It is not a de Polignac number, because 72540549 - 2⁷ = 72540421 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72540569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19834 + ... + 23204.

It is an arithmetic number, because the mean of its divisors is an integer number (6727140).

Almost surely, 2^72540549 is an apocalyptic number.

It is an amenable number.

72540549 is a deficient number, since it is larger than the sum of its proper divisors (35093691).

72540549 is a wasteful number, since it uses less digits than its factorization.

72540549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4177 (or 4171 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 72540549 is about 8517.0739693864. The cubic root of 72540549 is about 417.0552693163.

The spelling of 72540549 in words is "seventy-two million, five hundred forty thousand, five hundred forty-nine".