256387632 has 40 divisors (see below), whose sum is σ = 676432896. Its totient is φ = 83643456.

The previous prime is 256387631. The next prime is 256387633. The reversal of 256387632 is 236783652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256387631) and next prime (256387633).

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (256387631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54568 + ... + 59079.

Almost surely, 2^256387632 is an apocalyptic number.

It is an amenable number.

256387632 is an abundant number, since it is smaller than the sum of its proper divisors (420045264).

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

256387632 is a wasteful number, since it uses less digits than its factorization.

256387632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113705 (or 113699 counting only the distinct ones).

The product of its digits is 362880, while the sum is 42.

The square root of 256387632 is about 16012.1089179408. The cubic root of 256387632 is about 635.2807422101.

The spelling of 256387632 in words is "two hundred fifty-six million, three hundred eighty-seven thousand, six hundred thirty-two".