99999648 has 72 divisors (see below), whose sum is σ = 325005408. Its totient is φ = 28570752.

The previous prime is 99999643. The next prime is 99999677. The reversal of 99999648 is 84699999.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22786 + ... + 26817.

It is an arithmetic number, because the mean of its divisors is an integer number (4513964).

Almost surely, 2^99999648 is an apocalyptic number.

It is an amenable number.

99999648 is an abundant number, since it is smaller than the sum of its proper divisors (225005760).

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

99999648 is a wasteful number, since it uses less digits than its factorization.

99999648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49626 (or 49615 counting only the distinct ones).

The product of its digits is 11337408, while the sum is 63.

The square root of 99999648 is about 9999.9823999845. The cubic root of 99999648 is about 464.1583387475.

The spelling of 99999648 in words is "ninety-nine million, nine hundred ninety-nine thousand, six hundred forty-eight".