16647990 has 32 divisors (see below), whose sum is σ = 42059520. Its totient is φ = 4205664.

The previous prime is 16647979. The next prime is 16647991. The reversal of 16647990 is 9974661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16647991) 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, 14034 + ... + 15173.

It is an arithmetic number, because the mean of its divisors is an integer number (1314360).

Almost surely, 2^16647990 is an apocalyptic number.

16647990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16647990 is an abundant number, since it is smaller than the sum of its proper divisors (25411530).

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

16647990 is a wasteful number, since it uses less digits than its factorization.

16647990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29236.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 16647990 is about 4080.1948482885. The cubic root of 16647990 is about 255.3410277631.

The spelling of 16647990 in words is "sixteen million, six hundred forty-seven thousand, nine hundred ninety".