3256661220 has 24 divisors (see below), whose sum is σ = 9118651584. Its totient is φ = 868442976.

The previous prime is 3256661209. The next prime is 3256661231. The reversal of 3256661220 is 221666523.

It is an interprime number because it is at equal distance from previous prime (3256661209) and next prime (3256661231).

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, 27138784 + ... + 27138903.

It is an arithmetic number, because the mean of its divisors is an integer number (379943816).

Almost surely, 2^3256661220 is an apocalyptic number.

3256661220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3256661220 is an abundant number, since it is smaller than the sum of its proper divisors (5861990364).

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

3256661220 is a wasteful number, since it uses less digits than its factorization.

3256661220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54277699 (or 54277697 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 3256661220 is about 57067.1641138755. The cubic root of 3256661220 is about 1482.2593352905.

The spelling of 3256661220 in words is "three billion, two hundred fifty-six million, six hundred sixty-one thousand, two hundred twenty".