256239100 has 72 divisors (see below), whose sum is σ = 610273440. Its totient is φ = 92801280.

The previous prime is 256239089. The next prime is 256239119. The reversal of 256239100 is 1932652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67041 + ... + 70759.

It is an arithmetic number, because the mean of its divisors is an integer number (8476020).

Almost surely, 2^256239100 is an apocalyptic number.

256239100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256239100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305136720).

256239100 is an abundant number, since it is smaller than the sum of its proper divisors (354034340).

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

256239100 is a wasteful number, since it uses less digits than its factorization.

256239100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3799 (or 3792 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 256239100 is about 16007.4701311606. The cubic root of 256239100 is about 635.1580403128.

The spelling of 256239100 in words is "two hundred fifty-six million, two hundred thirty-nine thousand, one hundred".