8440338778 has 4 divisors (see below), whose sum is σ = 12660508170. Its totient is φ = 4220169388.

The previous prime is 8440338757. The next prime is 8440338791. The reversal of 8440338778 is 8778330448.

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

It can be written as a sum of positive squares in only one way, i.e., 4433828569 + 4006510209 = 66587^2 + 63297^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2110084693 + ... + 2110084696.

Almost surely, 2^8440338778 is an apocalyptic number.

8440338778 is a deficient number, since it is larger than the sum of its proper divisors (4220169392).

8440338778 is a wasteful number, since it uses less digits than its factorization.

8440338778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4220169391.

The product of its (nonzero) digits is 3612672, while the sum is 52.

The square root of 8440338778 is about 91871.3164050674. The cubic root of 8440338778 is about 2036.0415017793.

The spelling of 8440338778 in words is "eight billion, four hundred forty million, three hundred thirty-eight thousand, seven hundred seventy-eight".