133688814 has 16 divisors (see below), whose sum is σ = 305574528. Its totient is φ = 38196792.

The previous prime is 133688813. The next prime is 133688887. The reversal of 133688814 is 418886331.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 3183067 = 133688814 / (1 + 3 + 3 + 6 + 8 + 8 + 8 + 1 + 4).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133688813) 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, 1591492 + ... + 1591575.

It is an arithmetic number, because the mean of its divisors is an integer number (19098408).

Almost surely, 2^133688814 is an apocalyptic number.

133688814 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

133688814 is an abundant number, since it is smaller than the sum of its proper divisors (171885714).

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

133688814 is a wasteful number, since it uses less digits than its factorization.

133688814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3183079.

The product of its digits is 110592, while the sum is 42.

The square root of 133688814 is about 11562.3879021593. The cubic root of 133688814 is about 511.3265656894.

The spelling of 133688814 in words is "one hundred thirty-three million, six hundred eighty-eight thousand, eight hundred fourteen".