998886664 has 8 divisors (see below), whose sum is σ = 1872912510. Its totient is φ = 499443328.

The previous prime is 998886661. The next prime is 998886671. The reversal of 998886664 is 466688899.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 897481764 + 101404900 = 29958^2 + 10070^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 998886596 and 998886605.

It is not an unprimeable number, because it can be changed into a prime (998886661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62430409 + ... + 62430424.

Almost surely, 2^998886664 is an apocalyptic number.

It is an amenable number.

998886664 is a deficient number, since it is larger than the sum of its proper divisors (874025846).

998886664 is a wasteful number, since it uses less digits than its factorization.

998886664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124860839 (or 124860835 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 64.

The square root of 998886664 is about 31605.1683115278. The cubic root of 998886664 is about 999.6287501906.

The spelling of 998886664 in words is "nine hundred ninety-eight million, eight hundred eighty-six thousand, six hundred sixty-four".