16642688 has 16 divisors (see below), whose sum is σ = 33155610. Its totient is φ = 8321280.

The previous prime is 16642687. The next prime is 16642697. The reversal of 16642688 is 88624661.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 61504 = 4072^2 + 248^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (16642687) by changing a digit.

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 as a sum of consecutive naturals, namely, 64883 + ... + 65138.

Almost surely, 2^16642688 is an apocalyptic number.

It is an amenable number.

16642688 is a deficient number, since it is larger than the sum of its proper divisors (16512922).

16642688 is an equidigital number, since it uses as much as digits as its factorization.

16642688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130035 (or 130023 counting only the distinct ones).

The product of its digits is 110592, while the sum is 41.

The square root of 16642688 is about 4079.5450726766. The cubic root of 16642688 is about 255.3139181466.

The spelling of 16642688 in words is "sixteen million, six hundred forty-two thousand, six hundred eighty-eight".