133687552 has 72 divisors (see below), whose sum is σ = 280207872. Its totient is φ = 63590400.

The previous prime is 133687537. The next prime is 133687573. The reversal of 133687552 is 255786331.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 493177 + ... + 493447.

It is an arithmetic number, because the mean of its divisors is an integer number (3891776).

Almost surely, 2^133687552 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 133687552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140103936).

133687552 is an abundant number, since it is smaller than the sum of its proper divisors (146520320).

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

133687552 is an equidigital number, since it uses as much as digits as its factorization.

133687552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375 (or 361 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 133687552 is about 11562.3333285285. Note that the first 4 decimals coincide. The cubic root of 133687552 is about 511.3249567387.

It can be divided in two parts, 1336 and 87552, that added together give a palindrome (88888).

The spelling of 133687552 in words is "one hundred thirty-three million, six hundred eighty-seven thousand, five hundred fifty-two".