72456757 has 4 divisors (see below), whose sum is σ = 72485280. Its totient is φ = 72428236.

The previous prime is 72456731. The next prime is 72456793. The reversal of 72456757 is 75765427.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72456757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72450757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10033 + ... + 15670.

It is an arithmetic number, because the mean of its divisors is an integer number (18121320).

Almost surely, 2^72456757 is an apocalyptic number.

It is an amenable number.

72456757 is a deficient number, since it is larger than the sum of its proper divisors (28523).

72456757 is a wasteful number, since it uses less digits than its factorization.

72456757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28522.

The product of its digits is 411600, while the sum is 43.

The square root of 72456757 is about 8512.1534878079. The cubic root of 72456757 is about 416.8946264774.

The spelling of 72456757 in words is "seventy-two million, four hundred fifty-six thousand, seven hundred fifty-seven".