66204256 has 48 divisors (see below), whose sum is σ = 139209840. Its totient is φ = 30883840.

The previous prime is 66204221. The next prime is 66204263. The reversal of 66204256 is 65240266.

It is a congruent number.

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, 70800 + ... + 71728.

It is an arithmetic number, because the mean of its divisors is an integer number (2900205).

Almost surely, 2^66204256 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 66204256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69604920).

66204256 is an abundant number, since it is smaller than the sum of its proper divisors (73005584).

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

66204256 is a wasteful number, since it uses less digits than its factorization.

66204256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087 (or 1079 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 66204256 is about 8136.5997812354. The cubic root of 66204256 is about 404.5404654230.

The spelling of 66204256 in words is "sixty-six million, two hundred four thousand, two hundred fifty-six".