16687332 has 18 divisors (see below), whose sum is σ = 42181958. Its totient is φ = 5562432.

The previous prime is 16687309. The next prime is 16687337. The reversal of 16687332 is 23378661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16451136 + 236196 = 4056^2 + 486^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 463537 = 16687332 / (1 + 6 + 6 + 8 + 7 + 3 + 3 + 2).

It is not an unprimeable number, because it can be changed into a prime (16687337) 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 in 5 ways as a sum of consecutive naturals, for example, 231733 + ... + 231804.

Almost surely, 2^16687332 is an apocalyptic number.

16687332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16687332 is an abundant number, since it is smaller than the sum of its proper divisors (25494626).

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

16687332 is a wasteful number, since it uses less digits than its factorization.

16687332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463547 (or 463542 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 16687332 is about 4085.0130966742. The cubic root of 16687332 is about 255.5420074593.

The spelling of 16687332 in words is "sixteen million, six hundred eighty-seven thousand, three hundred thirty-two".