16640650 has 24 divisors (see below), whose sum is σ = 33333804. Its totient is φ = 6144000.

The previous prime is 16640647. The next prime is 16640651. The reversal of 16640650 is 5604661.

It can be written as a sum of positive squares in 6 ways, for example, as 9138529 + 7502121 = 3023^2 + 2739^2 .

It is a super-2 number, since 2×16640650² = 553822464845000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640651) 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, 12151 + ... + 13450.

Almost surely, 2^16640650 is an apocalyptic number.

16640650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16640650 is an abundant number, since it is smaller than the sum of its proper divisors (16693154).

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

16640650 is a wasteful number, since it uses less digits than its factorization.

16640650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25626 (or 25621 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 16640650 is about 4079.2952822761. The cubic root of 16640650 is about 255.3034961321.

The spelling of 16640650 in words is "sixteen million, six hundred forty thousand, six hundred fifty".