72766559 has 4 divisors (see below), whose sum is σ = 72906216. Its totient is φ = 72626904.

The previous prime is 72766537. The next prime is 72766571. The reversal of 72766559 is 95566727.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72766559 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 (72766459) 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, 69044 + ... + 70089.

It is an arithmetic number, because the mean of its divisors is an integer number (18226554).

Almost surely, 2^72766559 is an apocalyptic number.

72766559 is a deficient number, since it is larger than the sum of its proper divisors (139657).

72766559 is a wasteful number, since it uses less digits than its factorization.

72766559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139656.

The product of its digits is 793800, while the sum is 47.

The square root of 72766559 is about 8530.3317051566. The cubic root of 72766559 is about 417.4879511744.

The spelling of 72766559 in words is "seventy-two million, seven hundred sixty-six thousand, five hundred fifty-nine".