1180640256 has 88 divisors (see below), whose sum is σ = 3191747904. Its totient is φ = 387932160.

The previous prime is 1180640249. The next prime is 1180640311. The reversal of 1180640256 is 6520460811.

It is a super-2 number, since 2×1180640256² = 2787822828175491072, which contains 22 as substring.

It is an unprimeable number.

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, 215406 + ... + 220818.

Almost surely, 2^1180640256 is an apocalyptic number.

1180640256 is a gapful number since it is divisible by the number (16) 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 1180640256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1595873952).

1180640256 is an abundant number, since it is smaller than the sum of its proper divisors (2011107648).

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

1180640256 is an equidigital number, since it uses as much as digits as its factorization.

1180640256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5507 (or 5489 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 1180640256 is about 34360.4460972206. The cubic root of 1180640256 is about 1056.9128928706.

The spelling of 1180640256 in words is "one billion, one hundred eighty million, six hundred forty thousand, two hundred fifty-six".