133815228 has 48 divisors (see below), whose sum is σ = 331420320. Its totient is φ = 41877504.

The previous prime is 133815223. The next prime is 133815257. The reversal of 133815228 is 822518331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133815223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156450 + ... + 157302.

It is an arithmetic number, because the mean of its divisors is an integer number (6904590).

Almost surely, 2^133815228 is an apocalyptic number.

It is an amenable number.

133815228 is an abundant number, since it is smaller than the sum of its proper divisors (197605092).

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

133815228 is a wasteful number, since it uses less digits than its factorization.

133815228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646 (or 1644 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 133815228 is about 11567.8532148364. The cubic root of 133815228 is about 511.4876823190.

The spelling of 133815228 in words is "one hundred thirty-three million, eight hundred fifteen thousand, two hundred twenty-eight".