16649649 has 12 divisors (see below), whose sum is σ = 24636612. Its totient is φ = 10828800.

The previous prime is 16649627. The next prime is 16649651. The reversal of 16649649 is 94694661.

It can be written as a sum of positive squares in 2 ways, for example, as 705600 + 15944049 = 840^2 + 3993^2 .

It is not a de Polignac number, because 16649649 - 2⁵ = 16649617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16649249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22192 + ... + 22929.

It is an arithmetic number, because the mean of its divisors is an integer number (2053051).

Almost surely, 2^16649649 is an apocalyptic number.

It is an amenable number.

16649649 is a deficient number, since it is larger than the sum of its proper divisors (7986963).

16649649 is a wasteful number, since it uses less digits than its factorization.

16649649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45168 (or 45165 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 16649649 is about 4080.3981423386. The cubic root of 16649649 is about 255.3495092013.

The spelling of 16649649 in words is "sixteen million, six hundred forty-nine thousand, six hundred forty-nine".