990000678 has 32 divisors (see below), whose sum is σ = 2147614560. Its totient is φ = 303011840.

The previous prime is 990000647. The next prime is 990000679. The reversal of 990000678 is 876000099.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990000679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114183 + ... + 122546.

It is an arithmetic number, because the mean of its divisors is an integer number (67112955).

Almost surely, 2^990000678 is an apocalyptic number.

990000678 is an abundant number, since it is smaller than the sum of its proper divisors (1157613882).

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

990000678 is a wasteful number, since it uses less digits than its factorization.

990000678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236792.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 990000678 is about 31464.2762192300. The cubic root of 990000678 is about 996.6557209319.

The spelling of 990000678 in words is "nine hundred ninety million, six hundred seventy-eight", and thus it is an aban number.