133445888 has 36 divisors (see below), whose sum is σ = 269409420. Its totient is φ = 65961984.

The previous prime is 133445887. The next prime is 133445933. The reversal of 133445888 is 888544331.

It can be written as a sum of positive squares in 2 ways, for example, as 81144064 + 52301824 = 9008^2 + 7232^2 .

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (133445887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19856 + ... + 25712.

It is an arithmetic number, because the mean of its divisors is an integer number (7483595).

Almost surely, 2^133445888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133445888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134704710).

133445888 is an abundant number, since it is smaller than the sum of its proper divisors (135963532).

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

133445888 is an frugal number, since it uses more digits than its factorization.

133445888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5962 (or 5948 counting only the distinct ones).

The product of its digits is 368640, while the sum is 44.

The square root of 133445888 is about 11551.8781157005. The cubic root of 133445888 is about 511.0166673357.

The spelling of 133445888 in words is "one hundred thirty-three million, four hundred forty-five thousand, eight hundred eighty-eight".