9912685888 has 42 divisors (see below), whose sum is σ = 22882001226. Its totient is φ = 4248292608.

The previous prime is 9912685883. The next prime is 9912685903. The reversal of 9912685888 is 8885862199.

It can be written as a sum of positive squares in only one way, i.e., 9041727744 + 870958144 = 95088^2 + 29512^2 .

It is a super-2 number, since 2×9912685888² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9912685883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1577331 + ... + 1583602.

It is an arithmetic number, because the mean of its divisors is an integer number (544809553).

Almost surely, 2^9912685888 is an apocalyptic number.

9912685888 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

9912685888 is an abundant number, since it is smaller than the sum of its proper divisors (12969315338).

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

9912685888 is a wasteful number, since it uses less digits than its factorization.

9912685888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3160959 (or 3160942 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 64.

The square root of 9912685888 is about 99562.4722875040. The cubic root of 9912685888 is about 2148.1459327259.

The spelling of 9912685888 in words is "nine billion, nine hundred twelve million, six hundred eighty-five thousand, eight hundred eighty-eight".