256554140 has 96 divisors (see below), whose sum is σ = 597155328. Its totient is φ = 92160000.

The previous prime is 256554101. The next prime is 256554143. The reversal of 256554140 is 41455652.

It is a super-2 number, since 2×256554140² = 131640053502279200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256554097 and 256554106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256554143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1064420 + ... + 1064660.

It is an arithmetic number, because the mean of its divisors is an integer number (6220368).

Almost surely, 2^256554140 is an apocalyptic number.

256554140 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 256554140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298577664).

256554140 is an abundant number, since it is smaller than the sum of its proper divisors (340601188).

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

256554140 is a wasteful number, since it uses less digits than its factorization.

256554140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 256554140 is about 16017.3075140612. The cubic root of 256554140 is about 635.4182377076.

The spelling of 256554140 in words is "two hundred fifty-six million, five hundred fifty-four thousand, one hundred forty".