9999678 has 16 divisors (see below), whose sum is σ = 21537936. Its totient is φ = 3076800.

The previous prime is 9999677. The next prime is 9999713. The reversal of 9999678 is 8769999.

9999678 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64023 + ... + 64178.

It is an arithmetic number, because the mean of its divisors is an integer number (1346121).

Almost surely, 2^9999678 is an apocalyptic number.

9999678 is an abundant number, since it is smaller than the sum of its proper divisors (11538258).

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

9999678 is a wasteful number, since it uses less digits than its factorization.

9999678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128219.

The product of its digits is 2204496, while the sum is 57.

The square root of 9999678 is about 3162.2267470882. The cubic root of 9999678 is about 215.4411565518.

The spelling of 9999678 in words is "nine million, nine hundred ninety-nine thousand, six hundred seventy-eight".