133281860 has 12 divisors (see below), whose sum is σ = 279891948. Its totient is φ = 53312736.

The previous prime is 133281859. The next prime is 133281877. The reversal of 133281860 is 68182331.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 83466496 + 49815364 = 9136^2 + 7058^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3332027 + ... + 3332066.

It is an arithmetic number, because the mean of its divisors is an integer number (23324329).

Almost surely, 2^133281860 is an apocalyptic number.

133281860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133281860 is an abundant number, since it is smaller than the sum of its proper divisors (146610088).

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

133281860 is a wasteful number, since it uses less digits than its factorization.

133281860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6664102 (or 6664100 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 133281860 is about 11544.7763079239. The cubic root of 133281860 is about 510.8072056327.

The spelling of 133281860 in words is "one hundred thirty-three million, two hundred eighty-one thousand, eight hundred sixty".