72757751 has 4 divisors (see below), whose sum is σ = 79372104. Its totient is φ = 66143400.

The previous prime is 72757733. The next prime is 72757757. The reversal of 72757751 is 15775727.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72757751 - 2¹⁸ = 72495607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72757699 and 72757708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72757757) 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, 3307160 + ... + 3307181.

It is an arithmetic number, because the mean of its divisors is an integer number (19843026).

Almost surely, 2^72757751 is an apocalyptic number.

72757751 is a deficient number, since it is larger than the sum of its proper divisors (6614353).

72757751 is a wasteful number, since it uses less digits than its factorization.

72757751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6614352.

The product of its digits is 120050, while the sum is 41.

The square root of 72757751 is about 8529.8154141810. The cubic root of 72757751 is about 417.4711056055.

The spelling of 72757751 in words is "seventy-two million, seven hundred fifty-seven thousand, seven hundred fifty-one".