998779012 has 36 divisors (see below), whose sum is σ = 2195670400. Its totient is φ = 389133360.

The previous prime is 998779003. The next prime is 998779013. The reversal of 998779012 is 210977899.

It is a super-2 number, since 2×998779012² = 1995119029623392288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (998779013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144012 + ... + 150787.

Almost surely, 2^998779012 is an apocalyptic number.

It is an amenable number.

998779012 is an abundant number, since it is smaller than the sum of its proper divisors (1196891388).

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

998779012 is a wasteful number, since it uses less digits than its factorization.

998779012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294832 (or 294819 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 52.

The square root of 998779012 is about 31603.4651897541. The cubic root of 998779012 is about 999.5928382418.

The spelling of 998779012 in words is "nine hundred ninety-eight million, seven hundred seventy-nine thousand, twelve".