133031808 has 384 divisors, whose sum is σ = 499000320. Its totient is φ = 34338816.

The previous prime is 133031807. The next prime is 133031827. The reversal of 133031808 is 808130331.

It is a tau number, because it is divible by the number of its divisors (384).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133031807) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2830441 + ... + 2830487.

It is an arithmetic number, because the mean of its divisors is an integer number (1299480).

Almost surely, 2^133031808 is an apocalyptic number.

133031808 is a gapful number since it is divisible by the number (18) 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 133031808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249500160).

133031808 is an abundant number, since it is smaller than the sum of its proper divisors (365968512).

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

133031808 is an equidigital number, since it uses as much as digits as its factorization.

133031808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 133031808 is about 11533.9415639234. The cubic root of 133031808 is about 510.4875614230.

The spelling of 133031808 in words is "one hundred thirty-three million, thirty-one thousand, eight hundred eight".