72542549 has 4 divisors (see below), whose sum is σ = 72596460. Its totient is φ = 72488640.

The previous prime is 72542521. The next prime is 72542557. The reversal of 72542549 is 94524527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94524527 = 79 ⋅1196513.

It can be written as a sum of positive squares in 2 ways, for example, as 13912900 + 58629649 = 3730^2 + 7657^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72542549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72542599) 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 3 ways as a sum of consecutive naturals, for example, 24884 + ... + 27645.

It is an arithmetic number, because the mean of its divisors is an integer number (18149115).

Almost surely, 2^72542549 is an apocalyptic number.

It is an amenable number.

72542549 is a deficient number, since it is larger than the sum of its proper divisors (53911).

72542549 is a wasteful number, since it uses less digits than its factorization.

72542549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53910.

The product of its digits is 100800, while the sum is 38.

The square root of 72542549 is about 8517.1913797918. The cubic root of 72542549 is about 417.0591021283.

The spelling of 72542549 in words is "seventy-two million, five hundred forty-two thousand, five hundred forty-nine".