256725420 has 96 divisors (see below), whose sum is σ = 828162048. Its totient is φ = 58205952.

The previous prime is 256725409. The next prime is 256725433. The reversal of 256725420 is 24527652.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50934 + ... + 55746.

It is an arithmetic number, because the mean of its divisors is an integer number (8626688).

Almost surely, 2^256725420 is an apocalyptic number.

256725420 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 256725420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (414081024).

256725420 is an abundant number, since it is smaller than the sum of its proper divisors (571436628).

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

256725420 is a wasteful number, since it uses less digits than its factorization.

256725420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4959 (or 4957 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 256725420 is about 16022.6533383207. The cubic root of 256725420 is about 635.5596116684.

The spelling of 256725420 in words is "two hundred fifty-six million, seven hundred twenty-five thousand, four hundred twenty".