99724385 has 4 divisors (see below), whose sum is σ = 119669268. Its totient is φ = 79779504.

The previous prime is 99724381. The next prime is 99724393. The reversal of 99724385 is 58342799.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58342799 = 59 ⋅988861.

It can be written as a sum of positive squares in 2 ways, for example, as 67108864 + 32615521 = 8192^2 + 5711^2 .

It is a cyclic number.

It is not a de Polignac number, because 99724385 - 2² = 99724381 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99724381) 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, 9972434 + ... + 9972443.

It is an arithmetic number, because the mean of its divisors is an integer number (29917317).

Almost surely, 2^99724385 is an apocalyptic number.

It is an amenable number.

99724385 is a deficient number, since it is larger than the sum of its proper divisors (19944883).

99724385 is a wasteful number, since it uses less digits than its factorization.

99724385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19944882.

The product of its digits is 544320, while the sum is 47.

The square root of 99724385 is about 9986.2097414384. The cubic root of 99724385 is about 463.7320604894.

The spelling of 99724385 in words is "ninety-nine million, seven hundred twenty-four thousand, three hundred eighty-five".