133640604 has 120 divisors (see below), whose sum is σ = 389687760. Its totient is φ = 39688704.

The previous prime is 133640537. The next prime is 133640609. The reversal of 133640604 is 406046331.

133640604 is a `hidden beast` number, since 13 + 3 + 6 + 40 + 604 = 666.

It is a super-2 number, since 2×133640604² = 35719622074969632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133640609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 104014 + ... + 105290.

It is an arithmetic number, because the mean of its divisors is an integer number (3247398).

Almost surely, 2^133640604 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 133640604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194843880).

133640604 is an abundant number, since it is smaller than the sum of its proper divisors (256047156).

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

133640604 is a wasteful number, since it uses less digits than its factorization.

133640604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329 (or 1318 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 133640604 is about 11560.3029372071. The cubic root of 133640604 is about 511.2650945342.

Adding to 133640604 its reverse (406046331), we get a palindrome (539686935).

The spelling of 133640604 in words is "one hundred thirty-three million, six hundred forty thousand, six hundred four".