999966428 has 12 divisors (see below), whose sum is σ = 1842043560. Its totient is φ = 473668272.

The previous prime is 999966427. The next prime is 999966439. The reversal of 999966428 is 824669999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999966421) 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 3 ways as a sum of consecutive naturals, for example, 6578651 + ... + 6578802.

It is an arithmetic number, because the mean of its divisors is an integer number (153503630).

Almost surely, 2^999966428 is an apocalyptic number.

It is an amenable number.

999966428 is a deficient number, since it is larger than the sum of its proper divisors (842077132).

999966428 is a wasteful number, since it uses less digits than its factorization.

999966428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13157476 (or 13157474 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 62.

The square root of 999966428 is about 31622.2457773005. The cubic root of 999966428 is about 999.9888092081.

The spelling of 999966428 in words is "nine hundred ninety-nine million, nine hundred sixty-six thousand, four hundred twenty-eight".