66964688 has 20 divisors (see below), whose sum is σ = 148279200. Its totient is φ = 28699104.

The previous prime is 66964673. The next prime is 66964699. The reversal of 66964688 is 88646966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298838 + ... + 299061.

It is an arithmetic number, because the mean of its divisors is an integer number (7413960).

Almost surely, 2^66964688 is an apocalyptic number.

It is an amenable number.

66964688 is an abundant number, since it is smaller than the sum of its proper divisors (81314512).

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

66964688 is a wasteful number, since it uses less digits than its factorization.

66964688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597914 (or 597908 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 53.

The square root of 66964688 is about 8183.1954638760. The cubic root of 66964688 is about 406.0834435817.

The spelling of 66964688 in words is "sixty-six million, nine hundred sixty-four thousand, six hundred eighty-eight".