1998682564 has 6 divisors (see below), whose sum is σ = 3497694494. Its totient is φ = 999341280.

The previous prime is 1998682531. The next prime is 1998682591. The reversal of 1998682564 is 4652868991.

It can be written as a sum of positive squares in only one way, i.e., 1611380164 + 387302400 = 40142^2 + 19680^2 .

It is a super-2 number, since 2×1998682564² = 7989463983275228192, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1998682499 and 1998682508.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249835317 + ... + 249835324.

Almost surely, 2^1998682564 is an apocalyptic number.

It is an amenable number.

1998682564 is a deficient number, since it is larger than the sum of its proper divisors (1499011930).

1998682564 is a wasteful number, since it uses less digits than its factorization.

1998682564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499670645 (or 499670643 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 58.

The square root of 1998682564 is about 44706.6277413092. The cubic root of 1998682564 is about 1259.6443449044.

The spelling of 1998682564 in words is "one billion, nine hundred ninety-eight million, six hundred eighty-two thousand, five hundred sixty-four".