5078767781 has 4 divisors (see below), whose sum is σ = 5083315692. Its totient is φ = 5074219872.

The previous prime is 5078767777. The next prime is 5078767801. The reversal of 5078767781 is 1877678705.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2987169025 + 2091598756 = 54655^2 + 45734^2 .

It is a cyclic number.

It is not a de Polignac number, because 5078767781 - 2² = 5078767777 is a prime.

It is a super-2 number, since 2×5078767781² = 51587764346647327922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5078767181) 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 3 ways as a sum of consecutive naturals, for example, 2272280 + ... + 2274513.

It is an arithmetic number, because the mean of its divisors is an integer number (1270828923).

Almost surely, 2^5078767781 is an apocalyptic number.

It is an amenable number.

5078767781 is a deficient number, since it is larger than the sum of its proper divisors (4547911).

5078767781 is a wasteful number, since it uses less digits than its factorization.

5078767781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4547910.

The product of its (nonzero) digits is 4609920, while the sum is 56.

The square root of 5078767781 is about 71265.4739758321. The cubic root of 5078767781 is about 1718.9086032971.

The spelling of 5078767781 in words is "five billion, seventy-eight million, seven hundred sixty-seven thousand, seven hundred eighty-one".