66312756 has 42 divisors (see below), whose sum is σ = 173999042. Its totient is φ = 22103280.

The previous prime is 66312713. The next prime is 66312773. The reversal of 66312756 is 65721366.

It can be written as a sum of positive squares in only one way, i.e., 42693156 + 23619600 = 6534^2 + 4860^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 66312756.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 8455 + ... + 14286.

Almost surely, 2^66312756 is an apocalyptic number.

It is an amenable number.

66312756 is an abundant number, since it is smaller than the sum of its proper divisors (107686286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66312756 is a wasteful number, since it uses less digits than its factorization.

66312756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22763 (or 22746 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 66312756 is about 8143.2644559783. The cubic root of 66312756 is about 404.7613408716.

The spelling of 66312756 in words is "sixty-six million, three hundred twelve thousand, seven hundred fifty-six".