133645644 has 36 divisors (see below), whose sum is σ = 368539080. Its totient is φ = 40498560.

The previous prime is 133645613. The next prime is 133645649. The reversal of 133645644 is 446546331.

133645644 is a `hidden beast` number, since 1 + 3 + 3 + 6 + 4 + 5 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×133645644² = 35722316320349472, which contains 22 as substring.

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 = 133645599 and 133645608.

It is not an unprimeable number, because it can be changed into a prime (133645649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168349 + ... + 169140.

Almost surely, 2^133645644 is an apocalyptic number.

It is an amenable number.

133645644 is an abundant number, since it is smaller than the sum of its proper divisors (234893436).

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

133645644 is a wasteful number, since it uses less digits than its factorization.

133645644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337510 (or 337505 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 133645644 is about 11560.5209225190. The cubic root of 133645644 is about 511.2715215821.

The spelling of 133645644 in words is "one hundred thirty-three million, six hundred forty-five thousand, six hundred forty-four".