16344778 has 4 divisors (see below), whose sum is σ = 24517170. Its totient is φ = 8172388.

The previous prime is 16344763. The next prime is 16344817. The reversal of 16344778 is 87744361.

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., 8543929 + 7800849 = 2923^2 + 2793^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 16344778.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4086193 + ... + 4086196.

Almost surely, 2^16344778 is an apocalyptic number.

16344778 is a deficient number, since it is larger than the sum of its proper divisors (8172392).

16344778 is an equidigital number, since it uses as much as digits as its factorization.

16344778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8172391.

The product of its digits is 112896, while the sum is 40.

The square root of 16344778 is about 4042.8675466802. The cubic root of 16344778 is about 253.7813337026.

The spelling of 16344778 in words is "sixteen million, three hundred forty-four thousand, seven hundred seventy-eight".