16223778 has 24 divisors (see below), whose sum is σ = 35478300. Its totient is φ = 5357664.

The previous prime is 16223747. The next prime is 16223783. The reversal of 16223778 is 87732261.

It can be written as a sum of positive squares in 2 ways, for example, as 14311089 + 1912689 = 3783^2 + 1383^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2173 + ... + 6096.

Almost surely, 2^16223778 is an apocalyptic number.

16223778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16223778 is an abundant number, since it is smaller than the sum of its proper divisors (19254522).

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

16223778 is a wasteful number, since it uses less digits than its factorization.

16223778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8386 (or 8383 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 16223778 is about 4027.8751221953. The cubic root of 16223778 is about 253.1535362433.

The spelling of 16223778 in words is "sixteen million, two hundred twenty-three thousand, seven hundred seventy-eight".