998642636 has 6 divisors (see below), whose sum is σ = 1747624620. Its totient is φ = 499321316.

The previous prime is 998642629. The next prime is 998642647. The reversal of 998642636 is 636246899.

998642636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×998642636² = 1994574228874056992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124830326 + ... + 124830333.

It is an arithmetic number, because the mean of its divisors is an integer number (291270770).

Almost surely, 2^998642636 is an apocalyptic number.

It is an amenable number.

998642636 is a deficient number, since it is larger than the sum of its proper divisors (748981984).

998642636 is a wasteful number, since it uses less digits than its factorization.

998642636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249660663 (or 249660661 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 53.

The square root of 998642636 is about 31601.3075045954. The cubic root of 998642636 is about 999.5473404636.

The spelling of 998642636 in words is "nine hundred ninety-eight million, six hundred forty-two thousand, six hundred thirty-six".