256540554 has 32 divisors (see below), whose sum is σ = 589752000. Its totient is φ = 82564272.

The previous prime is 256540549. The next prime is 256540561. The reversal of 256540554 is 455045652.

256540554 is a `hidden beast` number, since 2 + 5 + 65 + 40 + 554 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80344 + ... + 83475.

It is an arithmetic number, because the mean of its divisors is an integer number (18429750).

Almost surely, 2^256540554 is an apocalyptic number.

256540554 is an abundant number, since it is smaller than the sum of its proper divisors (333211446).

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

256540554 is a wasteful number, since it uses less digits than its factorization.

256540554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163859 (or 163853 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

The square root of 256540554 is about 16016.8834047077. The cubic root of 256540554 is about 635.4070211738.

The spelling of 256540554 in words is "two hundred fifty-six million, five hundred forty thousand, five hundred fifty-four".