72764665 has 8 divisors (see below), whose sum is σ = 87823368. Its totient is φ = 57874560.

The previous prime is 72764651. The next prime is 72764687. The reversal of 72764665 is 56646727.

It can be written as a sum of positive squares in 4 ways, for example, as 4272489 + 68492176 = 2067^2 + 8276^2 .

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

It is not a de Polignac number, because 72764665 - 2¹⁷ = 72633593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41196 + ... + 42925.

It is an arithmetic number, because the mean of its divisors is an integer number (10977921).

Almost surely, 2^72764665 is an apocalyptic number.

It is an amenable number.

72764665 is a deficient number, since it is larger than the sum of its proper divisors (15058703).

72764665 is a wasteful number, since it uses less digits than its factorization.

72764665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84299.

The product of its digits is 423360, while the sum is 43.

The square root of 72764665 is about 8530.2206888216. The cubic root of 72764665 is about 417.4843289563.

Adding to 72764665 its product of digits (423360), we get a square (73188025 = 8555²).

It can be divided in two parts, 7 and 2764665, that added together give a palindrome (2764672).

The spelling of 72764665 in words is "seventy-two million, seven hundred sixty-four thousand, six hundred sixty-five".