256499033280 has 448 divisors, whose sum is σ = 1000578908160. Its totient is φ = 54359617536.

The previous prime is 256499033269. The next prime is 256499033291. The reversal of 256499033280 is 82330994652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256499033269) and next prime (256499033291).

It is a tau number, because it is divible by the number of its divisors (448).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5979589 + ... + 6022331.

Almost surely, 2^256499033280 is an apocalyptic number.

256499033280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256499033280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (500289454080).

256499033280 is an abundant number, since it is smaller than the sum of its proper divisors (744079874880).

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

256499033280 is a wasteful number, since it uses less digits than its factorization.

256499033280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42836 (or 42826 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 51.

The spelling of 256499033280 in words is "two hundred fifty-six billion, four hundred ninety-nine million, thirty-three thousand, two hundred eighty".