99581400 has 168 divisors, whose sum is σ = 347639580. Its totient is φ = 26516160.

The previous prime is 99581399. The next prime is 99581401. The reversal of 99581400 is 418599.

It is an interprime number because it is at equal distance from previous prime (99581399) and next prime (99581401).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99581401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 145459 + ... + 146141.

Almost surely, 2^99581400 is an apocalyptic number.

99581400 is a gapful number since it is divisible by the number (90) 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 99581400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173819790).

99581400 is an abundant number, since it is smaller than the sum of its proper divisors (248058180).

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

99581400 is a wasteful number, since it uses less digits than its factorization.

99581400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717 (or 693 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 99581400 is about 9979.0480507912. The cubic root of 99581400 is about 463.5103211954.

Adding to 99581400 its reverse (418599), we get a palindrome (99999999).

The spelling of 99581400 in words is "ninety-nine million, five hundred eighty-one thousand, four hundred".