72730646 has 8 divisors (see below), whose sum is σ = 113839344. Its totient is φ = 34784200.

The previous prime is 72730633. The next prime is 72730661. The reversal of 72730646 is 64603727.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 790505 + ... + 790596.

It is an arithmetic number, because the mean of its divisors is an integer number (14229918).

Almost surely, 2^72730646 is an apocalyptic number.

72730646 is a deficient number, since it is larger than the sum of its proper divisors (41108698).

72730646 is a wasteful number, since it uses less digits than its factorization.

72730646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581126.

The product of its (nonzero) digits is 42336, while the sum is 35.

The square root of 72730646 is about 8528.2264275757. The cubic root of 72730646 is about 417.4192579347.

The spelling of 72730646 in words is "seventy-two million, seven hundred thirty thousand, six hundred forty-six".