99806388 has 96 divisors (see below), whose sum is σ = 272885760. Its totient is φ = 28055040.

The previous prime is 99806387. The next prime is 99806401. The reversal of 99806388 is 88360899.

It is a super-2 number, since 2×99806388² = 19922630171213088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 99806388.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99806383) 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, 176995 + ... + 177557.

It is an arithmetic number, because the mean of its divisors is an integer number (2842560).

Almost surely, 2^99806388 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 99806388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136442880).

99806388 is an abundant number, since it is smaller than the sum of its proper divisors (173079372).

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

99806388 is a wasteful number, since it uses less digits than its factorization.

99806388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677 (or 675 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 99806388 is about 9990.3147097576. The cubic root of 99806388 is about 463.8591340620.

The spelling of 99806388 in words is "ninety-nine million, eight hundred six thousand, three hundred eighty-eight".