998476644 has 144 divisors (see below), whose sum is σ = 2764468224. Its totient is φ = 277358400.

The previous prime is 998476639. The next prime is 998476651. The reversal of 998476644 is 446674899.

998476644 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 2×998476644² = 1993911217227005472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9693897 + ... + 9693999.

It is an arithmetic number, because the mean of its divisors is an integer number (19197696).

Almost surely, 2^998476644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998476644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1382234112).

998476644 is an abundant number, since it is smaller than the sum of its proper divisors (1765991580).

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

998476644 is a wasteful number, since it uses less digits than its factorization.

998476644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 173 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 57.

The square root of 998476644 is about 31598.6810484235. The cubic root of 998476644 is about 999.4919566023.

It can be divided in two parts, 99847 and 6644, that added together give a triangular number (106491 = T₄₆₁).

The spelling of 998476644 in words is "nine hundred ninety-eight million, four hundred seventy-six thousand, six hundred forty-four".