133688420 has 24 divisors (see below), whose sum is σ = 292953024. Its totient is φ = 51150176.

The previous prime is 133688381. The next prime is 133688431. The reversal of 133688420 is 24886331.

It is a happy number.

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, 144854 + ... + 145773.

It is an arithmetic number, because the mean of its divisors is an integer number (12206376).

Almost surely, 2^133688420 is an apocalyptic number.

133688420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133688420 is an abundant number, since it is smaller than the sum of its proper divisors (159264604).

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

133688420 is a wasteful number, since it uses less digits than its factorization.

133688420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290659 (or 290657 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 133688420 is about 11562.3708641437. The cubic root of 133688420 is about 511.3260633715.

The spelling of 133688420 in words is "one hundred thirty-three million, six hundred eighty-eight thousand, four hundred twenty".