133345520 has 80 divisors (see below), whose sum is σ = 386546688. Its totient is φ = 41560320.

The previous prime is 133345519. The next prime is 133345543. The reversal of 133345520 is 25543331.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 133345520.

It is a congruent number.

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, 4664 + ... + 16983.

Almost surely, 2^133345520 is an apocalyptic number.

133345520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133345520 is an abundant number, since it is smaller than the sum of its proper divisors (253201168).

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

133345520 is a wasteful number, since it uses less digits than its factorization.

133345520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21678 (or 21672 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 26.

The square root of 133345520 is about 11547.5330698812. The cubic root of 133345520 is about 510.8885190509. Note that the first 3 decimals are identical.

Adding to 133345520 its reverse (25543331), we get a palindrome (158888851).

The spelling of 133345520 in words is "one hundred thirty-three million, three hundred forty-five thousand, five hundred twenty".