256740540 has 96 divisors (see below), whose sum is σ = 864837120. Its totient is φ = 55593216.

The previous prime is 256740529. The next prime is 256740541. The reversal of 256740540 is 45047652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256740541) 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, 8107 + ... + 24066.

It is an arithmetic number, because the mean of its divisors is an integer number (9008720).

Almost surely, 2^256740540 is an apocalyptic number.

256740540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256740540 is an abundant number, since it is smaller than the sum of its proper divisors (608096580).

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

256740540 is a wasteful number, since it uses less digits than its factorization.

256740540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32211 (or 32209 counting only the distinct ones).

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

The square root of 256740540 is about 16023.1251633381. The cubic root of 256740540 is about 635.5720886470.

The spelling of 256740540 in words is "two hundred fifty-six million, seven hundred forty thousand, five hundred forty".