72656765 has 8 divisors (see below), whose sum is σ = 87500088. Its totient is φ = 57917440.

The previous prime is 72656737. The next prime is 72656767. The reversal of 72656765 is 56765627.

It can be written as a sum of positive squares in 4 ways, for example, as 16736281 + 55920484 = 4091^2 + 7478^2 .

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

It is not a de Polignac number, because 72656765 - 2²⁰ = 71608189 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 (72656767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24452 + ... + 27261.

It is an arithmetic number, because the mean of its divisors is an integer number (10937511).

Almost surely, 2^72656765 is an apocalyptic number.

It is an amenable number.

72656765 is a deficient number, since it is larger than the sum of its proper divisors (14843323).

72656765 is a wasteful number, since it uses less digits than its factorization.

72656765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51999.

The product of its digits is 529200, while the sum is 44.

The square root of 72656765 is about 8523.8937698683. The cubic root of 72656765 is about 417.2778695738.

The spelling of 72656765 in words is "seventy-two million, six hundred fifty-six thousand, seven hundred sixty-five".