133505828 has 12 divisors (see below), whose sum is σ = 247378572. Its totient is φ = 62826240.

The previous prime is 133505807. The next prime is 133505851. The reversal of 133505828 is 828505331.

It can be written as a sum of positive squares in 2 ways, for example, as 41499364 + 92006464 = 6442^2 + 9592^2 .

It is a super-2 number, since 2×133505828² = 35647612219931168, which contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 981593 + ... + 981728.

It is an arithmetic number, because the mean of its divisors is an integer number (20614881).

Almost surely, 2^133505828 is an apocalyptic number.

It is an amenable number.

133505828 is a deficient number, since it is larger than the sum of its proper divisors (113872744).

133505828 is a wasteful number, since it uses less digits than its factorization.

133505828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1963342 (or 1963340 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 133505828 is about 11554.4722077644. The cubic root of 133505828 is about 511.0931671429.

The spelling of 133505828 in words is "one hundred thirty-three million, five hundred five thousand, eight hundred twenty-eight".