133706556 has 36 divisors (see below), whose sum is σ = 339885000. Its totient is φ = 44317728.

The previous prime is 133706537. The next prime is 133706557. The reversal of 133706556 is 655607331.

It is a happy number.

133706556 is a `hidden beast` number, since 1 + 33 + 70 + 6 + 556 = 666.

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

It is a super-2 number, since 2×133706556² = 35754886234762272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 133706556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133706557) 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, 3931 + ... + 16818.

It is an arithmetic number, because the mean of its divisors is an integer number (9441250).

Almost surely, 2^133706556 is an apocalyptic number.

It is an amenable number.

133706556 is an abundant number, since it is smaller than the sum of its proper divisors (206178444).

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

133706556 is a wasteful number, since it uses less digits than its factorization.

133706556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20938 (or 20933 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 36.

The square root of 133706556 is about 11563.1551057659. The cubic root of 133706556 is about 511.3491842725.

The spelling of 133706556 in words is "one hundred thirty-three million, seven hundred six thousand, five hundred fifty-six".