133568028 has 90 divisors (see below), whose sum is σ = 383914608. Its totient is φ = 40463280.

The previous prime is 133568021. The next prime is 133568033. The reversal of 133568028 is 820865331.

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

It is a junction number, because it is equal to n+sod(n) for n = 133567983 and 133568001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133568021) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 37501 + ... + 40907.

Almost surely, 2^133568028 is an apocalyptic number.

133568028 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 133568028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191957304).

133568028 is an abundant number, since it is smaller than the sum of its proper divisors (250346580).

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

133568028 is a wasteful number, since it uses less digits than its factorization.

133568028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3445 (or 3423 counting only the distinct ones).

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

The square root of 133568028 is about 11557.1634928299. The cubic root of 133568028 is about 511.1725271224.

The spelling of 133568028 in words is "one hundred thirty-three million, five hundred sixty-eight thousand, twenty-eight".