133546640 has 40 divisors (see below), whose sum is σ = 312890688. Its totient is φ = 53006720.

The previous prime is 133546631. The next prime is 133546657. The reversal of 133546640 is 46645331.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 133546597 and 133546606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4109 + ... + 16851.

Almost surely, 2^133546640 is an apocalyptic number.

133546640 is a gapful number since it is divisible by the number (10) 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 133546640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156445344).

133546640 is an abundant number, since it is smaller than the sum of its proper divisors (179344048).

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

133546640 is a wasteful number, since it uses less digits than its factorization.

133546640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12887 (or 12881 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 133546640 is about 11556.2381422330. The cubic root of 133546640 is about 511.1452412971.

The spelling of 133546640 in words is "one hundred thirty-three million, five hundred forty-six thousand, six hundred forty".