99924781 has 16 divisors (see below), whose sum is σ = 115430400. Its totient is φ = 85546800.

The previous prime is 99924767. The next prime is 99924787. The reversal of 99924781 is 18742999.

It is a cyclic number.

It is not a de Polignac number, because 99924781 - 2¹³ = 99916589 is a prime.

It is a super-2 number, since 2×99924781² = 19969923715795922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99924787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36076 + ... + 38746.

It is an arithmetic number, because the mean of its divisors is an integer number (7214400).

Almost surely, 2^99924781 is an apocalyptic number.

It is an amenable number.

99924781 is a deficient number, since it is larger than the sum of its proper divisors (15505619).

99924781 is a wasteful number, since it uses less digits than its factorization.

99924781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2880.

The product of its digits is 326592, while the sum is 49.

The square root of 99924781 is about 9996.2383424966. The cubic root of 99924781 is about 464.0424756127.

The spelling of 99924781 in words is "ninety-nine million, nine hundred twenty-four thousand, seven hundred eighty-one".