8294778644 has 12 divisors (see below), whose sum is σ = 14824711104. Its totient is φ = 4059146904.

The previous prime is 8294778641. The next prime is 8294778649. The reversal of 8294778644 is 4468774928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8294778641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22060394 + ... + 22060769.

It is an arithmetic number, because the mean of its divisors is an integer number (1235392592).

Almost surely, 2^8294778644 is an apocalyptic number.

It is an amenable number.

8294778644 is a deficient number, since it is larger than the sum of its proper divisors (6529932460).

8294778644 is a wasteful number, since it uses less digits than its factorization.

8294778644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44121214 (or 44121212 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 59.

The square root of 8294778644 is about 91075.6753694421. The cubic root of 8294778644 is about 2024.2691987939.

The spelling of 8294778644 in words is "eight billion, two hundred ninety-four million, seven hundred seventy-eight thousand, six hundred forty-four".