256366164 has 48 divisors (see below), whose sum is σ = 640028480. Its totient is φ = 79626240.

The previous prime is 256366133. The next prime is 256366169. The reversal of 256366164 is 461663652.

It is a super-2 number, since 2×256366164² = 131447220088149792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256366169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4692 + ... + 23124.

Almost surely, 2^256366164 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 256366164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320014240).

256366164 is an abundant number, since it is smaller than the sum of its proper divisors (383662316).

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

256366164 is a wasteful number, since it uses less digits than its factorization.

256366164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18520 (or 18518 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The square root of 256366164 is about 16011.4385362465. The cubic root of 256366164 is about 635.2630104816.

It can be divided in two parts, 256366 and 164, that multiplied together give a palindrome (42044024).

The spelling of 256366164 in words is "two hundred fifty-six million, three hundred sixty-six thousand, one hundred sixty-four".