66400712 has 32 divisors (see below), whose sum is σ = 142732800. Its totient is φ = 28368384.

The previous prime is 66400661. The next prime is 66400751. The reversal of 66400712 is 21700466.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18089 + ... + 21447.

It is an arithmetic number, because the mean of its divisors is an integer number (4460400).

Almost surely, 2^66400712 is an apocalyptic number.

It is an amenable number.

66400712 is an abundant number, since it is smaller than the sum of its proper divisors (76332088).

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

66400712 is a wasteful number, since it uses less digits than its factorization.

66400712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3725 (or 3721 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 66400712 is about 8148.6632032500. The cubic root of 66400712 is about 404.9402177674.

The spelling of 66400712 in words is "sixty-six million, four hundred thousand, seven hundred twelve".