2581209900 has 54 divisors (see below), whose sum is σ = 8090661852. Its totient is φ = 688322400.

The previous prime is 2581209887. The next prime is 2581209919. The reversal of 2581209900 is 99021852.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1433106 + ... + 1434905.

Almost surely, 2^2581209900 is an apocalyptic number.

2581209900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2581209900 is an abundant number, since it is smaller than the sum of its proper divisors (5509451952).

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

2581209900 is a wasteful number, since it uses less digits than its factorization.

2581209900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2868031 (or 2868021 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 2581209900 is about 50805.6089423205. The cubic root of 2581209900 is about 1371.7483317823.

The spelling of 2581209900 in words is "two billion, five hundred eighty-one million, two hundred nine thousand, nine hundred".