99999669 has 32 divisors (see below), whose sum is σ = 167169024. Its totient is φ = 51655680.

The previous prime is 99999643. The next prime is 99999677. The reversal of 99999669 is 96699999.

It is not a de Polignac number, because 99999669 - 2⁷ = 99999541 is a prime.

It is a super-2 number, since 2×99999669² = 19999867600219122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99994669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43462 + ... + 45704.

It is an arithmetic number, because the mean of its divisors is an integer number (5224032).

Almost surely, 2^99999669 is an apocalyptic number.

It is an amenable number.

99999669 is a deficient number, since it is larger than the sum of its proper divisors (67169355).

99999669 is a wasteful number, since it uses less digits than its factorization.

99999669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2457.

The product of its digits is 19131876, while the sum is 66.

The square root of 99999669 is about 9999.9834499863. The cubic root of 99999669 is about 464.1583712387.

The spelling of 99999669 in words is "ninety-nine million, nine hundred ninety-nine thousand, six hundred sixty-nine".