2551398128 has 40 divisors (see below), whose sum is σ = 5241576720. Its totient is φ = 1199715840.

The previous prime is 2551398041. The next prime is 2551398133. The reversal of 2551398128 is 8218931552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11018 + ... + 72278.

It is an arithmetic number, because the mean of its divisors is an integer number (131039418).

Almost surely, 2^2551398128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2551398128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2620788360).

2551398128 is an abundant number, since it is smaller than the sum of its proper divisors (2690178592).

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

2551398128 is a wasteful number, since it uses less digits than its factorization.

2551398128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61425 (or 61419 counting only the distinct ones).

The product of its digits is 172800, while the sum is 44.

The square root of 2551398128 is about 50511.3663248184. The cubic root of 2551398128 is about 1366.4468511295.

The spelling of 2551398128 in words is "two billion, five hundred fifty-one million, three hundred ninety-eight thousand, one hundred twenty-eight".