16688985 has 16 divisors (see below), whose sum is σ = 28273536. Its totient is φ = 8377088.

The previous prime is 16688983. The next prime is 16688999. The reversal of 16688985 is 58988661.

It is a cyclic number.

It is not a de Polignac number, because 16688985 - 2¹ = 16688983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (16688983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32469 + ... + 32978.

It is an arithmetic number, because the mean of its divisors is an integer number (1767096).

Almost surely, 2^16688985 is an apocalyptic number.

16688985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16688985 is a deficient number, since it is larger than the sum of its proper divisors (11584551).

16688985 is a wasteful number, since it uses less digits than its factorization.

16688985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65472.

The product of its digits is 829440, while the sum is 51.

The square root of 16688985 is about 4085.2154165968. The cubic root of 16688985 is about 255.5504449374.

The spelling of 16688985 in words is "sixteen million, six hundred eighty-eight thousand, nine hundred eighty-five".