1305421568 has 216 divisors, whose sum is σ = 3161095056. Its totient is φ = 535265280.

The previous prime is 1305421561. The next prime is 1305421571. The reversal of 1305421568 is 8651245031.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305421561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19483871 + ... + 19483937.

Almost surely, 2^1305421568 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 1305421568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1580547528).

1305421568 is an abundant number, since it is smaller than the sum of its proper divisors (1855673488).

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

1305421568 is a wasteful number, since it uses less digits than its factorization.

1305421568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 1305421568 is about 36130.6181513685. The cubic root of 1305421568 is about 1092.9079738711.

Adding to 1305421568 its reverse (8651245031), we get a palindrome (9956666599).

The spelling of 1305421568 in words is "one billion, three hundred five million, four hundred twenty-one thousand, five hundred sixty-eight".