99787128 has 96 divisors (see below), whose sum is σ = 295857360. Its totient is φ = 27955200.

The previous prime is 99787123. The next prime is 99787147. The reversal of 99787128 is 82178799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99787123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61528 + ... + 63128.

Almost surely, 2^99787128 is an apocalyptic number.

99787128 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99787128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147928680).

99787128 is an abundant number, since it is smaller than the sum of its proper divisors (196070232).

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

99787128 is a wasteful number, since it uses less digits than its factorization.

99787128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677 (or 1666 counting only the distinct ones).

The product of its digits is 508032, while the sum is 51.

The square root of 99787128 is about 9989.3507296521. The cubic root of 99787128 is about 463.8292946171.

The spelling of 99787128 in words is "ninety-nine million, seven hundred eighty-seven thousand, one hundred twenty-eight".