5278712778 has 12 divisors (see below), whose sum is σ = 11437211058. Its totient is φ = 1759570920.

The previous prime is 5278712759. The next prime is 5278712807. The reversal of 5278712778 is 8772178725.

It can be written as a sum of positive squares in only one way, i.e., 4802905809 + 475806969 = 69303^2 + 21813^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 146630893 + ... + 146630928.

Almost surely, 2^5278712778 is an apocalyptic number.

5278712778 is an abundant number, since it is smaller than the sum of its proper divisors (6158498280).

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

5278712778 is a wasteful number, since it uses less digits than its factorization.

5278712778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293261829 (or 293261826 counting only the distinct ones).

The product of its digits is 3073280, while the sum is 54.

The square root of 5278712778 is about 72654.7505535598. The cubic root of 5278712778 is about 1741.1760202790.

The spelling of 5278712778 in words is "five billion, two hundred seventy-eight million, seven hundred twelve thousand, seven hundred seventy-eight".