99999647 has 8 divisors (see below), whose sum is σ = 109181520. Its totient is φ = 90832960.

The previous prime is 99999643. The next prime is 99999677. The reversal of 99999647 is 74699999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99999647 - 2² = 99999643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99999647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13379 + ... + 19467.

It is an arithmetic number, because the mean of its divisors is an integer number (13647690).

Almost surely, 2^99999647 is an apocalyptic number.

99999647 is a deficient number, since it is larger than the sum of its proper divisors (9181873).

99999647 is a wasteful number, since it uses less digits than its factorization.

99999647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7593.

The product of its digits is 9920232, while the sum is 62.

The square root of 99999647 is about 9999.9823499844. The cubic root of 99999647 is about 464.1583372003.

The spelling of 99999647 in words is "ninety-nine million, nine hundred ninety-nine thousand, six hundred forty-seven".