2381778636 has 12 divisors (see below), whose sum is σ = 5557483512. Its totient is φ = 793926208.

The previous prime is 2381778629. The next prime is 2381778653. The reversal of 2381778636 is 6368771832.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99240765 + ... + 99240788.

It is an arithmetic number, because the mean of its divisors is an integer number (463123626).

Almost surely, 2^2381778636 is an apocalyptic number.

It is an amenable number.

2381778636 is an abundant number, since it is smaller than the sum of its proper divisors (3175704876).

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

2381778636 is a wasteful number, since it uses less digits than its factorization.

2381778636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198481560 (or 198481558 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 51.

The square root of 2381778636 is about 48803.4695078127. The cubic root of 2381778636 is about 1335.4689606346.

The spelling of 2381778636 in words is "two billion, three hundred eighty-one million, seven hundred seventy-eight thousand, six hundred thirty-six".