2551620 has 72 divisors (see below), whose sum is σ = 7632576. Its totient is φ = 635712.

The previous prime is 2551607. The next prime is 2551639. The reversal of 2551620 is 261552.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59319 + ... + 59361.

It is an arithmetic number, because the mean of its divisors is an integer number (106008).

2^2551620 is an apocalyptic number.

2551620 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 2551620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3816288).

2551620 is an abundant number, since it is smaller than the sum of its proper divisors (5080956).

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

2551620 is a wasteful number, since it uses less digits than its factorization.

2551620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 2551620 is about 1597.3791034066. The cubic root of 2551620 is about 136.6486459153.

The spelling of 2551620 in words is "two million, five hundred fifty-one thousand, six hundred twenty".