249555880 has 128 divisors (see below), whose sum is σ = 687456000. Its totient is φ = 79626240.

The previous prime is 249555833. The next prime is 249555907. The reversal of 249555880 is 88555942.

It is a self number, because there is not a number n which added to its sum of digits gives 249555880.

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 31 ways as a sum of consecutive naturals, for example, 324136 + ... + 324904.

It is an arithmetic number, because the mean of its divisors is an integer number (5370750).

Almost surely, 2^249555880 is an apocalyptic number.

249555880 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 249555880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (343728000).

249555880 is an abundant number, since it is smaller than the sum of its proper divisors (437900120).

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

249555880 is a wasteful number, since it uses less digits than its factorization.

249555880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867 (or 863 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 46.

The square root of 249555880 is about 15797.3377503933. The cubic root of 249555880 is about 629.5872664069.

The spelling of 249555880 in words is "two hundred forty-nine million, five hundred fifty-five thousand, eight hundred eighty".