133865536 has 56 divisors (see below), whose sum is σ = 310692800. Its totient is φ = 56028672.

The previous prime is 133865521. The next prime is 133865539. The reversal of 133865536 is 635568331.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-3 number, since 3×133865536³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (133865539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15790 + ... + 22738.

Almost surely, 2^133865536 is an apocalyptic number.

133865536 is a gapful number since it is divisible by the number (16) 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 133865536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155346400).

133865536 is an abundant number, since it is smaller than the sum of its proper divisors (176827264).

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

133865536 is an equidigital number, since it uses as much as digits as its factorization.

133865536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7011 (or 7001 counting only the distinct ones).

The product of its digits is 194400, while the sum is 40.

The square root of 133865536 is about 11570.0274848420. The cubic root of 133865536 is about 511.5517724297.

The spelling of 133865536 in words is "one hundred thirty-three million, eight hundred sixty-five thousand, five hundred thirty-six".