133333640 has 128 divisors (see below), whose sum is σ = 353808000. Its totient is φ = 44697600.

The previous prime is 133333609. The next prime is 133333667. The reversal of 133333640 is 46333331.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 342566 + ... + 342954.

It is an arithmetic number, because the mean of its divisors is an integer number (2764125).

Almost surely, 2^133333640 is an apocalyptic number.

133333640 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 133333640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176904000).

133333640 is an abundant number, since it is smaller than the sum of its proper divisors (220474360).

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

133333640 is a wasteful number, since it uses less digits than its factorization.

133333640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 26.

The square root of 133333640 is about 11547.0186628411. The cubic root of 133333640 is about 510.8733465980.

Adding to 133333640 its reverse (46333331), we get a palindrome (179666971).

The spelling of 133333640 in words is "one hundred thirty-three million, three hundred thirty-three thousand, six hundred forty".