133383640 has 64 divisors (see below), whose sum is σ = 325231200. Its totient is φ = 48940032.

The previous prime is 133383623. The next prime is 133383641. The reversal of 133383640 is 46383331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133383641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92364 + ... + 93796.

Almost surely, 2^133383640 is an apocalyptic number.

133383640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133383640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162615600).

133383640 is an abundant number, since it is smaller than the sum of its proper divisors (191847560).

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

133383640 is a wasteful number, since it uses less digits than its factorization.

133383640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636 (or 1632 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 133383640 is about 11549.1835209248. The cubic root of 133383640 is about 510.9371976388.

The spelling of 133383640 in words is "one hundred thirty-three million, three hundred eighty-three thousand, six hundred forty".