998839578 has 16 divisors (see below), whose sum is σ = 2179286496. Its totient is φ = 302678640.

The previous prime is 998839571. The next prime is 998839591. The reversal of 998839578 is 875938899.

It is a Harshad number since it is a multiple of its sum of digits (66), and also a Moran number because the ratio is a prime number: 15133933 = 998839578 / (9 + 9 + 8 + 8 + 3 + 9 + 5 + 7 + 8).

It is not an unprimeable number, because it can be changed into a prime (998839571) 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, 7566901 + ... + 7567032.

It is an arithmetic number, because the mean of its divisors is an integer number (136205406).

Almost surely, 2^998839578 is an apocalyptic number.

998839578 is an abundant number, since it is smaller than the sum of its proper divisors (1180446918).

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

998839578 is a wasteful number, since it uses less digits than its factorization.

998839578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15133949.

The product of its digits is 39191040, while the sum is 66.

The square root of 998839578 is about 31604.4233929366. The cubic root of 998839578 is about 999.6130429502.

The spelling of 998839578 in words is "nine hundred ninety-eight million, eight hundred thirty-nine thousand, five hundred seventy-eight".