99919636 has 18 divisors (see below), whose sum is σ = 182796362. Its totient is φ = 47786640.

The previous prime is 99919619. The next prime is 99919661. The reversal of 99919636 is 63691999.

It can be written as a sum of positive squares in only one way, i.e., 72420100 + 27499536 = 8510^2 + 5244^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21495 + ... + 25726.

Almost surely, 2^99919636 is an apocalyptic number.

It is an amenable number.

99919636 is a deficient number, since it is larger than the sum of its proper divisors (82876726).

99919636 is a wasteful number, since it uses less digits than its factorization.

99919636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47271 (or 47246 counting only the distinct ones).

The product of its digits is 708588, while the sum is 52.

The square root of 99919636 is about 9995.9809923789. The cubic root of 99919636 is about 464.0345111568.

The spelling of 99919636 in words is "ninety-nine million, nine hundred nineteen thousand, six hundred thirty-six".