256261900 has 18 divisors (see below), whose sum is σ = 556088540. Its totient is φ = 102504720.

The previous prime is 256261879. The next prime is 256261909. The reversal of 256261900 is 9162652.

It is a super-2 number, since 2×256261900² = 131340322783220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256261909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1281210 + ... + 1281409.

Almost surely, 2^256261900 is an apocalyptic number.

256261900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256261900 is an abundant number, since it is smaller than the sum of its proper divisors (299826640).

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

256261900 is a wasteful number, since it uses less digits than its factorization.

256261900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562633 (or 2562626 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 256261900 is about 16008.1822828202. The cubic root of 256261900 is about 635.1768784134.

The spelling of 256261900 in words is "two hundred fifty-six million, two hundred sixty-one thousand, nine hundred".