16788645 has 24 divisors (see below), whose sum is σ = 29211000. Its totient is φ = 8919936.

The previous prime is 16788641. The next prime is 16788661. The reversal of 16788645 is 54688761.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2883204 + 13905441 = 1698^2 + 3729^2 .

It is not a de Polignac number, because 16788645 - 2² = 16788641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 16788645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16788641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15171 + ... + 16239.

It is an arithmetic number, because the mean of its divisors is an integer number (1217125).

Almost surely, 2^16788645 is an apocalyptic number.

16788645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16788645 is a deficient number, since it is larger than the sum of its proper divisors (12422355).

16788645 is a wasteful number, since it uses less digits than its factorization.

16788645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429 (or 1426 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 16788645 is about 4097.3949040823. The cubic root of 16788645 is about 256.0581177051.

The spelling of 16788645 in words is "sixteen million, seven hundred eighty-eight thousand, six hundred forty-five".