2551378128 has 120 divisors (see below), whose sum is σ = 7164862848. Its totient is φ = 781986816.

The previous prime is 2551378097. The next prime is 2551378133. The reversal of 2551378128 is 8218731552.

It is a self number, because there is not a number n which added to its sum of digits gives 2551378128.

It is a congruent number.

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, 2976676 + ... + 2977532.

Almost surely, 2^2551378128 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 2551378128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3582431424).

2551378128 is an abundant number, since it is smaller than the sum of its proper divisors (4613484720).

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

2551378128 is a wasteful number, since it uses less digits than its factorization.

2551378128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261 (or 1242 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 2551378128 is about 50511.1683491879. The cubic root of 2551378128 is about 1366.4432806678.

The spelling of 2551378128 in words is "two billion, five hundred fifty-one million, three hundred seventy-eight thousand, one hundred twenty-eight".