1298621568 has 128 divisors (see below), whose sum is σ = 3669503040. Its totient is φ = 405504000.

The previous prime is 1298621567. The next prime is 1298621581. The reversal of 1298621568 is 8651268921.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (1298621563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2160468 + ... + 2161068.

Almost surely, 2^1298621568 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 1298621568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1834751520).

1298621568 is an abundant number, since it is smaller than the sum of its proper divisors (2370881472).

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

1298621568 is a wasteful number, since it uses less digits than its factorization.

1298621568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966 (or 954 counting only the distinct ones).

The product of its digits is 414720, while the sum is 48.

The square root of 1298621568 is about 36036.3922722572. The cubic root of 1298621568 is about 1091.0070002629.

The spelling of 1298621568 in words is "one billion, two hundred ninety-eight million, six hundred twenty-one thousand, five hundred sixty-eight".