133972644 has 48 divisors (see below), whose sum is σ = 337998080. Its totient is φ = 41057280.

The previous prime is 133972637. The next prime is 133972661. The reversal of 133972644 is 446279331.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40692 + ... + 43860.

Almost surely, 2^133972644 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 133972644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168999040).

133972644 is an abundant number, since it is smaller than the sum of its proper divisors (204025436).

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

133972644 is a wasteful number, since it uses less digits than its factorization.

133972644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3460 (or 3458 counting only the distinct ones).

The product of its digits is 108864, while the sum is 39.

The square root of 133972644 is about 11574.6552432459. The cubic root of 133972644 is about 511.6881696988.

The spelling of 133972644 in words is "one hundred thirty-three million, nine hundred seventy-two thousand, six hundred forty-four".