133868520 has 48 divisors (see below), whose sum is σ = 435073860. Its totient is φ = 35698176.

The previous prime is 133868491. The next prime is 133868521. The reversal of 133868520 is 25868331.

It can be written as a sum of positive squares in 2 ways, for example, as 132296004 + 1572516 = 11502^2 + 1254^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (133868521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 185569 + ... + 186288.

Almost surely, 2^133868520 is an apocalyptic number.

133868520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133868520 is an abundant number, since it is smaller than the sum of its proper divisors (301205340).

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

133868520 is a wasteful number, since it uses less digits than its factorization.

133868520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371874 (or 371867 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 133868520 is about 11570.1564380090. The cubic root of 133868520 is about 511.5555734059. Note that the first 4 decimals are identical.

The spelling of 133868520 in words is "one hundred thirty-three million, eight hundred sixty-eight thousand, five hundred twenty".