256138200 has 240 divisors, whose sum is σ = 904291080. Its totient is φ = 67184640.

The previous prime is 256138199. The next prime is 256138231. The reversal of 256138200 is 2831652.

256138200 is a `hidden beast` number, since 25 + 613 + 8 + 20 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1571319 + ... + 1571481.

Almost surely, 2^256138200 is an apocalyptic number.

256138200 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 256138200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (452145540).

256138200 is an abundant number, since it is smaller than the sum of its proper divisors (648152880).

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

256138200 is a wasteful number, since it uses less digits than its factorization.

256138200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 256138200 is about 16004.3181672947. The cubic root of 256138200 is about 635.0746600375.

Adding to 256138200 its reverse (2831652), we get a palindrome (258969852).

The spelling of 256138200 in words is "two hundred fifty-six million, one hundred thirty-eight thousand, two hundred".