1298243664 has 30 divisors (see below), whose sum is σ = 3633279546. Its totient is φ = 432747840.

The previous prime is 1298243627. The next prime is 1298243669. The reversal of 1298243664 is 4663428921.

It can be written as a sum of positive squares in only one way, i.e., 1190250000 + 107993664 = 34500^2 + 10392^2 .

It is a super-2 number, since 2×1298243664² = 3370873222232289792, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1298243669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4507647 + ... + 4507934.

Almost surely, 2^1298243664 is an apocalyptic number.

It is an amenable number.

1298243664 is an abundant number, since it is smaller than the sum of its proper divisors (2335035882).

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

1298243664 is a wasteful number, since it uses less digits than its factorization.

1298243664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9015595 (or 9015586 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 1298243664 is about 36031.1485245752. The cubic root of 1298243664 is about 1090.9011608817.

The spelling of 1298243664 in words is "one billion, two hundred ninety-eight million, two hundred forty-three thousand, six hundred sixty-four".