133386428 has 72 divisors (see below), whose sum is σ = 290344320. Its totient is φ = 53343360.

The previous prime is 133386419. The next prime is 133386467. The reversal of 133386428 is 824683331.

It is a junction number, because it is equal to n+sod(n) for n = 133386391 and 133386400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175826 + ... + 176582.

It is an arithmetic number, because the mean of its divisors is an integer number (4032560).

Almost surely, 2^133386428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133386428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145172160).

133386428 is an abundant number, since it is smaller than the sum of its proper divisors (156957892).

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

133386428 is a wasteful number, since it uses less digits than its factorization.

133386428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835 (or 826 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 133386428 is about 11549.3042214672. The cubic root of 133386428 is about 510.9407575031.

The spelling of 133386428 in words is "one hundred thirty-three million, three hundred eighty-six thousand, four hundred twenty-eight".