72766557 has 6 divisors (see below), whose sum is σ = 105107262. Its totient is φ = 48511032.

The previous prime is 72766537. The next prime is 72766571. The reversal of 72766557 is 75566727.

It can be written as a sum of positive squares in only one way, i.e., 42889401 + 29877156 = 6549^2 + 5466^2 .

It is not a de Polignac number, because 72766557 - 2⁶ = 72766493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72766537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4042578 + ... + 4042595.

It is an arithmetic number, because the mean of its divisors is an integer number (17517877).

Almost surely, 2^72766557 is an apocalyptic number.

It is an amenable number.

72766557 is a deficient number, since it is larger than the sum of its proper divisors (32340705).

72766557 is a wasteful number, since it uses less digits than its factorization.

72766557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8085179 (or 8085176 counting only the distinct ones).

The product of its digits is 617400, while the sum is 45.

The square root of 72766557 is about 8530.3315879279. The cubic root of 72766557 is about 417.4879473495.

The spelling of 72766557 in words is "seventy-two million, seven hundred sixty-six thousand, five hundred fifty-seven".