5145281778 has 128 divisors (see below), whose sum is σ = 13450364928. Its totient is φ = 1273365504.

The previous prime is 5145281717. The next prime is 5145281783. The reversal of 5145281778 is 8771825415.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4334101 + ... + 4335287.

It is an arithmetic number, because the mean of its divisors is an integer number (105080976).

Almost surely, 2^5145281778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5145281778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6725182464).

5145281778 is an abundant number, since it is smaller than the sum of its proper divisors (8305083150).

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

5145281778 is a wasteful number, since it uses less digits than its factorization.

5145281778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696.

The product of its digits is 627200, while the sum is 48.

The square root of 5145281778 is about 71730.6195289013. The cubic root of 5145281778 is about 1726.3799672975.

The spelling of 5145281778 in words is "five billion, one hundred forty-five million, two hundred eighty-one thousand, seven hundred seventy-eight".