9985906724 has 12 divisors (see below), whose sum is σ = 17655495564. Its totient is φ = 4941479424.

The previous prime is 9985906681. The next prime is 9985906759. The reversal of 9985906724 is 4276095899.

It can be written as a sum of positive squares in 2 ways, for example, as 5064884224 + 4921022500 = 71168^2 + 70150^2 .

It is a super-4 number, since 4×9985906724⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12868049 + ... + 12868824.

It is an arithmetic number, because the mean of its divisors is an integer number (1471291297).

Almost surely, 2^9985906724 is an apocalyptic number.

It is an amenable number.

9985906724 is a deficient number, since it is larger than the sum of its proper divisors (7669588840).

9985906724 is a wasteful number, since it uses less digits than its factorization.

9985906724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25736974 (or 25736972 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 59.

The square root of 9985906724 is about 99929.5087749359. The cubic root of 9985906724 is about 2153.4221127748.

The spelling of 9985906724 in words is "nine billion, nine hundred eighty-five million, nine hundred six thousand, seven hundred twenty-four".