256634542 has 16 divisors (see below), whose sum is σ = 392273280. Its totient is φ = 125885752.

The previous prime is 256634527. The next prime is 256634557. The reversal of 256634542 is 245436652.

It is an interprime number because it is at equal distance from previous prime (256634527) and next prime (256634557).

It is a super-2 number, since 2×256634542² = 131722576295099528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64503 + ... + 68365.

It is an arithmetic number, because the mean of its divisors is an integer number (24517080).

Almost surely, 2^256634542 is an apocalyptic number.

256634542 is a deficient number, since it is larger than the sum of its proper divisors (135638738).

256634542 is a wasteful number, since it uses less digits than its factorization.

256634542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4487.

The product of its digits is 172800, while the sum is 37.

The square root of 256634542 is about 16019.8171649991. The cubic root of 256634542 is about 635.4846090930.

The spelling of 256634542 in words is "two hundred fifty-six million, six hundred thirty-four thousand, five hundred forty-two".