72730184 has 8 divisors (see below), whose sum is σ = 136369110. Its totient is φ = 36365088.

The previous prime is 72730183. The next prime is 72730193. The reversal of 72730184 is 48103727.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 56100100 + 16630084 = 7490^2 + 4078^2 .

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 72730184.

It is not an unprimeable number, because it can be changed into a prime (72730181) 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, 4545629 + ... + 4545644.

Almost surely, 2^72730184 is an apocalyptic number.

It is an amenable number.

72730184 is a deficient number, since it is larger than the sum of its proper divisors (63638926).

72730184 is a wasteful number, since it uses less digits than its factorization.

72730184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9091279 (or 9091275 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 72730184 is about 8528.1993410098. The cubic root of 72730184 is about 417.4183740885.

The spelling of 72730184 in words is "seventy-two million, seven hundred thirty thousand, one hundred eighty-four".