2551808 has 52 divisors (see below), whose sum is σ = 5897520. Its totient is φ = 1081344.

The previous prime is 2551793. The next prime is 2551817. The reversal of 2551808 is 8081552.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28628 + ... + 28716.

2^2551808 is an apocalyptic number.

2551808 is a gapful number since it is divisible by the number (28) 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 2551808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2948760).

2551808 is an abundant number, since it is smaller than the sum of its proper divisors (3345712).

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

2551808 is an frugal number, since it uses more digits than its factorization.

2551808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 2551808 is about 1597.4379487166. The cubic root of 2551808 is about 136.6520018636.

The spelling of 2551808 in words is "two million, five hundred fifty-one thousand, eight hundred eight".