66712764 has 24 divisors (see below), whose sum is σ = 156114000. Its totient is φ = 22173184.

The previous prime is 66712759. The next prime is 66712769. The reversal of 66712764 is 46721766.

It is an interprime number because it is at equal distance from previous prime (66712759) and next prime (66712769).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66712769) 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, 3639 + ... + 12110.

It is an arithmetic number, because the mean of its divisors is an integer number (6504750).

Almost surely, 2^66712764 is an apocalyptic number.

It is an amenable number.

66712764 is an abundant number, since it is smaller than the sum of its proper divisors (89401236).

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

66712764 is a wasteful number, since it uses less digits than its factorization.

66712764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16109 (or 16107 counting only the distinct ones).

The product of its digits is 84672, while the sum is 39.

The square root of 66712764 is about 8167.7881950991. The cubic root of 66712764 is about 405.5735692700.

It can be divided in two parts, 66712 and 764, that added together give a palindrome (67476).

The spelling of 66712764 in words is "sixty-six million, seven hundred twelve thousand, seven hundred sixty-four".