99678195864 has 256 divisors, whose sum is σ = 303149347200. Its totient is φ = 30163746816.

The previous prime is 99678195847. The next prime is 99678195887. The reversal of 99678195864 is 46859187699.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 99678195792 and 99678195801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 43469502 + ... + 43471794.

Almost surely, 2^99678195864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99678195864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151574673600).

99678195864 is an abundant number, since it is smaller than the sum of its proper divisors (203471151336).

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

99678195864 is a wasteful number, since it uses less digits than its factorization.

99678195864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571 (or 2561 counting only the distinct ones).

The product of its digits is 235146240, while the sum is 72.

The spelling of 99678195864 in words is "ninety-nine billion, six hundred seventy-eight million, one hundred ninety-five thousand, eight hundred sixty-four".