5256428778 has 12 divisors (see below), whose sum is σ = 11388929058. Its totient is φ = 1752142920.

The previous prime is 5256428777. The next prime is 5256428803. The reversal of 5256428778 is 8778246525.

5256428778 is a `hidden beast` number, since 5 + 2 + 564 + 2 + 8 + 7 + 78 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4277552409 + 978876369 = 65403^2 + 31287^2 .

It is not an unprimeable number, because it can be changed into a prime (5256428777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 146011893 + ... + 146011928.

Almost surely, 2^5256428778 is an apocalyptic number.

5256428778 is an abundant number, since it is smaller than the sum of its proper divisors (6132500280).

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

5256428778 is a wasteful number, since it uses less digits than its factorization.

5256428778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292023829 (or 292023826 counting only the distinct ones).

The product of its digits is 7526400, while the sum is 54.

The square root of 5256428778 is about 72501.2329412404. The cubic root of 5256428778 is about 1738.7224490612.

The spelling of 5256428778 in words is "five billion, two hundred fifty-six million, four hundred twenty-eight thousand, seven hundred seventy-eight".