256734140 has 48 divisors (see below), whose sum is σ = 581861280. Its totient is φ = 94590720.

The previous prime is 256734113. The next prime is 256734199. The reversal of 256734140 is 41437652.

It is a junction number, because it is equal to n+sod(n) for n = 256734097 and 256734106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178946 + ... + 180374.

It is an arithmetic number, because the mean of its divisors is an integer number (12122110).

Almost surely, 2^256734140 is an apocalyptic number.

256734140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256734140 is an abundant number, since it is smaller than the sum of its proper divisors (325127140).

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

256734140 is a wasteful number, since it uses less digits than its factorization.

256734140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142 (or 2140 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 256734140 is about 16022.9254507409. The cubic root of 256734140 is about 635.5668074460.

The spelling of 256734140 in words is "two hundred fifty-six million, seven hundred thirty-four thousand, one hundred forty".