5185406778 has 16 divisors (see below), whose sum is σ = 10377978336. Its totient is φ = 1727274800.

The previous prime is 5185406771. The next prime is 5185406783. The reversal of 5185406778 is 8776045815.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 5185406778.

It is not an unprimeable number, because it can be changed into a prime (5185406771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289101 + ... + 306512.

It is an arithmetic number, because the mean of its divisors is an integer number (648623646).

Almost surely, 2^5185406778 is an apocalyptic number.

5185406778 is an abundant number, since it is smaller than the sum of its proper divisors (5192571558).

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

5185406778 is a wasteful number, since it uses less digits than its factorization.

5185406778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597069.

The product of its (nonzero) digits is 1881600, while the sum is 51.

The square root of 5185406778 is about 72009.7686289853. The cubic root of 5185406778 is about 1730.8560230621.

The spelling of 5185406778 in words is "five billion, one hundred eighty-five million, four hundred six thousand, seven hundred seventy-eight".