256532540 has 24 divisors (see below), whose sum is σ = 587693232. Its totient is φ = 93284480.

The previous prime is 256532537. The next prime is 256532543. The reversal of 256532540 is 45235652.

It is an interprime number because it is at equal distance from previous prime (256532537) and next prime (256532543).

It is a junction number, because it is equal to n+sod(n) for n = 256532497 and 256532506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256532543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 582809 + ... + 583248.

It is an arithmetic number, because the mean of its divisors is an integer number (24487218).

Almost surely, 2^256532540 is an apocalyptic number.

256532540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256532540 is an abundant number, since it is smaller than the sum of its proper divisors (331160692).

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

256532540 is a wasteful number, since it uses less digits than its factorization.

256532540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166077 (or 1166075 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 32.

The square root of 256532540 is about 16016.6332292402. The cubic root of 256532540 is about 635.4004046697.

The spelling of 256532540 in words is "two hundred fifty-six million, five hundred thirty-two thousand, five hundred forty".