16778812 has 24 divisors (see below), whose sum is σ = 30965760. Its totient is φ = 7943280.

The previous prime is 16778809. The next prime is 16778819. The reversal of 16778812 is 21887761.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16778819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4389 + ... + 7267.

It is an arithmetic number, because the mean of its divisors is an integer number (1290240).

Almost surely, 2^16778812 is an apocalyptic number.

It is an amenable number.

16778812 is a deficient number, since it is larger than the sum of its proper divisors (14186948).

16778812 is a wasteful number, since it uses less digits than its factorization.

16778812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2961 (or 2959 counting only the distinct ones).

The product of its digits is 37632, while the sum is 40.

The square root of 16778812 is about 4096.1948195856. The cubic root of 16778812 is about 256.0081174184.

The spelling of 16778812 in words is "sixteen million, seven hundred seventy-eight thousand, eight hundred twelve".