2551276728 has 432 divisors, whose sum is σ = 9519330600. Its totient is φ = 610122240.

The previous prime is 2551276727. The next prime is 2551276733. The reversal of 2551276728 is 8276721552.

2551276728 is a `hidden beast` number, since 2 + 551 + 2 + 76 + 7 + 28 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551276727) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 6558358 + ... + 6558746.

Almost surely, 2^2551276728 is an apocalyptic number.

2551276728 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 2551276728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4759665300).

2551276728 is an abundant number, since it is smaller than the sum of its proper divisors (6968053872).

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

2551276728 is a wasteful number, since it uses less digits than its factorization.

2551276728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 425 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 2551276728 is about 50510.1646008009. The cubic root of 2551276728 is about 1366.4251781395.

The spelling of 2551276728 in words is "two billion, five hundred fifty-one million, two hundred seventy-six thousand, seven hundred twenty-eight".