66430256 has 40 divisors (see below), whose sum is σ = 135762144. Its totient is φ = 31426560.

The previous prime is 66430249. The next prime is 66430261. The reversal of 66430256 is 65203466.

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, 34766 + ... + 36626.

Almost surely, 2^66430256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66430256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67881072).

66430256 is an abundant number, since it is smaller than the sum of its proper divisors (69331888).

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

66430256 is a wasteful number, since it uses less digits than its factorization.

66430256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1989 (or 1983 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 66430256 is about 8150.4758143313. The cubic root of 66430256 is about 405.0002662194. Note that the first 3 decimals are identical.

The spelling of 66430256 in words is "sixty-six million, four hundred thirty thousand, two hundred fifty-six".