133015720 has 16 divisors (see below), whose sum is σ = 299285460. Its totient is φ = 53206272.

The previous prime is 133015691. The next prime is 133015759. The reversal of 133015720 is 27510331.

It can be written as a sum of positive squares in 2 ways, for example, as 131836324 + 1179396 = 11482^2 + 1086^2 .

It is a junction number, because it is equal to n+sod(n) for n = 133015691 and 133015700.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1662657 + ... + 1662736.

Almost surely, 2^133015720 is an apocalyptic number.

133015720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133015720 is an abundant number, since it is smaller than the sum of its proper divisors (166269740).

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

133015720 is a wasteful number, since it uses less digits than its factorization.

133015720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3325404 (or 3325400 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 133015720 is about 11533.2441229690. The cubic root of 133015720 is about 510.4669822470.

The spelling of 133015720 in words is "one hundred thirty-three million, fifteen thousand, seven hundred twenty".