5261257728 has 132 divisors (see below), whose sum is σ = 15852917808. Its totient is φ = 1677434880.

The previous prime is 5261257711. The next prime is 5261257753. The reversal of 5261257728 is 8277521625.

5261257728 is a `hidden beast` number, since 5 + 2 + 612 + 5 + 7 + 7 + 28 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199558 + ... + 224378.

Almost surely, 2^5261257728 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 5261257728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7926458904).

5261257728 is an abundant number, since it is smaller than the sum of its proper divisors (10591660080).

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

5261257728 is a wasteful number, since it uses less digits than its factorization.

5261257728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24870 (or 24849 counting only the distinct ones).

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

The square root of 5261257728 is about 72534.5278333016. The cubic root of 5261257728 is about 1739.2547264120.

The spelling of 5261257728 in words is "five billion, two hundred sixty-one million, two hundred fifty-seven thousand, seven hundred twenty-eight".