8428778 has 8 divisors (see below), whose sum is σ = 12673668. Its totient is φ = 4204224.

The previous prime is 8428769. The next prime is 8428789. The reversal of 8428778 is 8778248.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8427409 + 1369 = 2903^2 + 37^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 4001 + ... + 5732.

Almost surely, 2^8428778 is an apocalyptic number.

8428778 is a deficient number, since it is larger than the sum of its proper divisors (4244890).

8428778 is a wasteful number, since it uses less digits than its factorization.

8428778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10168.

The product of its digits is 200704, while the sum is 44.

The square root of 8428778 is about 2903.2357809864. The cubic root of 8428778 is about 203.5111484655.

The spelling of 8428778 in words is "eight million, four hundred twenty-eight thousand, seven hundred seventy-eight".