72724549 has 2 divisors, whose sum is σ = 72724550. Its totient is φ = 72724548.

The previous prime is 72724507. The next prime is 72724559. The reversal of 72724549 is 94542727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44315649 + 28408900 = 6657^2 + 5330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72724549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72724559) 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 as a sum of consecutive naturals, namely, 36362274 + 36362275.

It is an arithmetic number, because the mean of its divisors is an integer number (36362275).

Almost surely, 2^72724549 is an apocalyptic number.

It is an amenable number.

72724549 is a deficient number, since it is larger than the sum of its proper divisors (1).

72724549 is an equidigital number, since it uses as much as digits as its factorization.

72724549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 40.

The square root of 72724549 is about 8527.8689600626. The cubic root of 72724549 is about 417.4075935425.

The spelling of 72724549 in words is "seventy-two million, seven hundred twenty-four thousand, five hundred forty-nine".