72545730 has 32 divisors (see below), whose sum is σ = 178161984. Its totient is φ = 18895296.

The previous prime is 72545723. The next prime is 72545731. The reversal of 72545730 is 3754527.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72545691 and 72545700.

It is not an unprimeable number, because it can be changed into a prime (72545731) 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 15 ways as a sum of consecutive naturals, for example, 26829 + ... + 29408.

It is an arithmetic number, because the mean of its divisors is an integer number (5567562).

Almost surely, 2^72545730 is an apocalyptic number.

72545730 is an abundant number, since it is smaller than the sum of its proper divisors (105616254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72545730 is a wasteful number, since it uses less digits than its factorization.

72545730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56290.

The product of its (nonzero) digits is 29400, while the sum is 33.

The square root of 72545730 is about 8517.3781177073. The cubic root of 72545730 is about 417.0651980708.

The spelling of 72545730 in words is "seventy-two million, five hundred forty-five thousand, seven hundred thirty".