72613544 has 8 divisors (see below), whose sum is σ = 136150410. Its totient is φ = 36306768.

The previous prime is 72613537. The next prime is 72613549. The reversal of 72613544 is 44531627.

It can be written as a sum of positive squares in only one way, i.e., 63840100 + 8773444 = 7990^2 + 2962^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 72613544.

It is not an unprimeable number, because it can be changed into a prime (72613549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4538339 + ... + 4538354.

Almost surely, 2^72613544 is an apocalyptic number.

It is an amenable number.

72613544 is a deficient number, since it is larger than the sum of its proper divisors (63536866).

72613544 is a wasteful number, since it uses less digits than its factorization.

72613544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9076699 (or 9076695 counting only the distinct ones).

The product of its digits is 20160, while the sum is 32.

The square root of 72613544 is about 8521.3581077197. The cubic root of 72613544 is about 417.1951117643.

The spelling of 72613544 in words is "seventy-two million, six hundred thirteen thousand, five hundred forty-four".