256383990 has 96 divisors (see below), whose sum is σ = 700068096. Its totient is φ = 64975680.

The previous prime is 256383943. The next prime is 256384039. The reversal of 256383990 is 99383652.

256383990 is a `hidden beast` number, since 2 + 5 + 638 + 3 + 9 + 9 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 436477 + ... + 437063.

It is an arithmetic number, because the mean of its divisors is an integer number (7292376).

Almost surely, 2^256383990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256383990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350034048).

256383990 is an abundant number, since it is smaller than the sum of its proper divisors (443684106).

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

256383990 is a wasteful number, since it uses less digits than its factorization.

256383990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 256383990 is about 16011.9951911059. The cubic root of 256383990 is about 635.2777341303.

The spelling of 256383990 in words is "two hundred fifty-six million, three hundred eighty-three thousand, nine hundred ninety".