66064400 has 30 divisors (see below), whose sum is σ = 158720682. Its totient is φ = 26425600.

The previous prime is 66064393. The next prime is 66064421. The reversal of 66064400 is 446066.

It can be written as a sum of positive squares in 3 ways, for example, as 16 + 66064384 = 4^2 + 8128^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66064400.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 82181 + ... + 82980.

Almost surely, 2^66064400 is an apocalyptic number.

It is an amenable number.

66064400 is an abundant number, since it is smaller than the sum of its proper divisors (92656282).

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

66064400 is a wasteful number, since it uses less digits than its factorization.

66064400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165179 (or 165168 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 66064400 is about 8128.0009842519. Note that the first 3 decimals coincide. The cubic root of 66064400 is about 404.2554016856.

The spelling of 66064400 in words is "sixty-six million, sixty-four thousand, four hundred".