998649278 has 16 divisors (see below), whose sum is σ = 1690504560. Its totient is φ = 438278400.

The previous prime is 998649269. The next prime is 998649371. The reversal of 998649278 is 872946899.

It is a self number, because there is not a number n which added to its sum of digits gives 998649278.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 782003 + ... + 783278.

It is an arithmetic number, because the mean of its divisors is an integer number (105656535).

Almost surely, 2^998649278 is an apocalyptic number.

998649278 is a deficient number, since it is larger than the sum of its proper divisors (691855282).

998649278 is a wasteful number, since it uses less digits than its factorization.

998649278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565323.

The product of its digits is 15676416, while the sum is 62.

The square root of 998649278 is about 31601.4125950091. The cubic root of 998649278 is about 999.5495564644.

The spelling of 998649278 in words is "nine hundred ninety-eight million, six hundred forty-nine thousand, two hundred seventy-eight".