133447720 has 32 divisors (see below), whose sum is σ = 343152000. Its totient is φ = 45753408.

The previous prime is 133447709. The next prime is 133447747. The reversal of 133447720 is 27744331.

133447720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238020 + ... + 238579.

It is an arithmetic number, because the mean of its divisors is an integer number (10723500).

Almost surely, 2^133447720 is an apocalyptic number.

133447720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133447720 is an abundant number, since it is smaller than the sum of its proper divisors (209704280).

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

133447720 is a wasteful number, since it uses less digits than its factorization.

133447720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476617 (or 476613 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 133447720 is about 11551.9574098938. The cubic root of 133447720 is about 511.0190058073.

The spelling of 133447720 in words is "one hundred thirty-three million, four hundred forty-seven thousand, seven hundred twenty".