99724840 has 16 divisors (see below), whose sum is σ = 224380980. Its totient is φ = 39889920.

The previous prime is 99724831. The next prime is 99724841. The reversal of 99724840 is 4842799.

It can be written as a sum of positive squares in 2 ways, for example, as 92659876 + 7064964 = 9626^2 + 2658^2 .

It is not an unprimeable number, because it can be changed into a prime (99724841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1246521 + ... + 1246600.

Almost surely, 2^99724840 is an apocalyptic number.

It is an amenable number.

99724840 is an abundant number, since it is smaller than the sum of its proper divisors (124656140).

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

99724840 is a wasteful number, since it uses less digits than its factorization.

99724840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2493132 (or 2493128 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 99724840 is about 9986.2325228286. The cubic root of 99724840 is about 463.7327657591.

The spelling of 99724840 in words is "ninety-nine million, seven hundred twenty-four thousand, eight hundred forty".