16778964 has 12 divisors (see below), whose sum is σ = 39150944. Its totient is φ = 5592984.

The previous prime is 16778959. The next prime is 16778981. The reversal of 16778964 is 46987761.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 699112 + ... + 699135.

Almost surely, 2^16778964 is an apocalyptic number.

It is an amenable number.

16778964 is an abundant number, since it is smaller than the sum of its proper divisors (22371980).

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

16778964 is a wasteful number, since it uses less digits than its factorization.

16778964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398254 (or 1398252 counting only the distinct ones).

The product of its digits is 508032, while the sum is 48.

The square root of 16778964 is about 4096.2133733486. The cubic root of 16778964 is about 256.0088904790.

The spelling of 16778964 in words is "sixteen million, seven hundred seventy-eight thousand, nine hundred sixty-four".