256072140 has 72 divisors (see below), whose sum is σ = 780107328. Its totient is φ = 67991040.

The previous prime is 256072127. The next prime is 256072147. The reversal of 256072140 is 41270652.

It is not an unprimeable number, because it can be changed into a prime (256072147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40429 + ... + 46331.

It is an arithmetic number, because the mean of its divisors is an integer number (10834824).

Almost surely, 2^256072140 is an apocalyptic number.

256072140 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 256072140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (390053664).

256072140 is an abundant number, since it is smaller than the sum of its proper divisors (524035188).

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

256072140 is a wasteful number, since it uses less digits than its factorization.

256072140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6159 (or 6154 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 256072140 is about 16002.2542162034. The cubic root of 256072140 is about 635.0200584732.

The spelling of 256072140 in words is "two hundred fifty-six million, seventy-two thousand, one hundred forty".