256166420 has 12 divisors (see below), whose sum is σ = 537949524. Its totient is φ = 102466560.

The previous prime is 256166369. The next prime is 256166431. The reversal of 256166420 is 24661652.

It can be written as a sum of positive squares in 2 ways, for example, as 69789316 + 186377104 = 8354^2 + 13652^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6404141 + ... + 6404180.

It is an arithmetic number, because the mean of its divisors is an integer number (44829127).

Almost surely, 2^256166420 is an apocalyptic number.

256166420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256166420 is an abundant number, since it is smaller than the sum of its proper divisors (281783104).

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

256166420 is a wasteful number, since it uses less digits than its factorization.

256166420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12808330 (or 12808328 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 256166420 is about 16005.1997800715. The cubic root of 256166420 is about 635.0979822763.

The spelling of 256166420 in words is "two hundred fifty-six million, one hundred sixty-six thousand, four hundred twenty".