2551920 has 160 divisors (see below), whose sum is σ = 9523200. Its totient is φ = 564480.

The previous prime is 2551903. The next prime is 2551933. The reversal of 2551920 is 291552.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82305 + ... + 82335.

It is an arithmetic number, because the mean of its divisors is an integer number (59520).

2^2551920 is an apocalyptic number.

2551920 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 2551920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4761600).

2551920 is an abundant number, since it is smaller than the sum of its proper divisors (6971280).

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

2551920 is a wasteful number, since it uses less digits than its factorization.

2551920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 2551920 is about 1597.4730044667. The cubic root of 2551920 is about 136.6540010736.

The spelling of 2551920 in words is "two million, five hundred fifty-one thousand, nine hundred twenty".