133428285 has 12 divisors (see below), whose sum is σ = 231275772. Its totient is φ = 71161728.

The previous prime is 133428277. The next prime is 133428293. The reversal of 133428285 is 582824331.

It is an interprime number because it is at equal distance from previous prime (133428277) and next prime (133428293).

It can be written as a sum of positive squares in 2 ways, for example, as 86601636 + 46826649 = 9306^2 + 6843^2 .

It is not a de Polignac number, because 133428285 - 2³ = 133428277 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1482492 + ... + 1482581.

It is an arithmetic number, because the mean of its divisors is an integer number (19272981).

Almost surely, 2^133428285 is an apocalyptic number.

133428285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133428285 is a deficient number, since it is larger than the sum of its proper divisors (97847487).

133428285 is a wasteful number, since it uses less digits than its factorization.

133428285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2965084 (or 2965081 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 133428285 is about 11551.1161798330. The cubic root of 133428285 is about 510.9941967496.

The spelling of 133428285 in words is "one hundred thirty-three million, four hundred twenty-eight thousand, two hundred eighty-five".