13281564 has 24 divisors (see below), whose sum is σ = 31086720. Its totient is φ = 4413424.

The previous prime is 13281553. The next prime is 13281571. The reversal of 13281564 is 46518231.

13281564 = T₇₂ + T₇₃ + ... + T₄₃₀.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2767 + ... + 5849.

It is an arithmetic number, because the mean of its divisors is an integer number (1295280).

Almost surely, 2^13281564 is an apocalyptic number.

It is an amenable number.

13281564 is an abundant number, since it is smaller than the sum of its proper divisors (17805156).

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

13281564 is a wasteful number, since it uses less digits than its factorization.

13281564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3449 (or 3447 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 13281564 is about 3644.3880144683. The cubic root of 13281564 is about 236.8189255859.

Adding to 13281564 its reverse (46518231), we get a palindrome (59799795).

The spelling of 13281564 in words is "thirteen million, two hundred eighty-one thousand, five hundred sixty-four".