133494228 has 144 divisors (see below), whose sum is σ = 414960000. Its totient is φ = 36070272.

The previous prime is 133494223. The next prime is 133494233. The reversal of 133494228 is 822494331.

It is an interprime number because it is at equal distance from previous prime (133494223) and next prime (133494233).

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 = 133494192 and 133494201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133494223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 234328 + ... + 234896.

Almost surely, 2^133494228 is an apocalyptic number.

133494228 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 133494228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207480000).

133494228 is an abundant number, since it is smaller than the sum of its proper divisors (281465772).

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

133494228 is a wasteful number, since it uses less digits than its factorization.

133494228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619 (or 600 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 133494228 is about 11553.9702267229. The cubic root of 133494228 is about 511.0783641625.

The spelling of 133494228 in words is "one hundred thirty-three million, four hundred ninety-four thousand, two hundred twenty-eight".