133870728 has 32 divisors (see below), whose sum is σ = 346219200. Its totient is φ = 43084608.

The previous prime is 133870721. The next prime is 133870771. The reversal of 133870728 is 827078331.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (133870721) 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, 95476 + ... + 96867.

It is an arithmetic number, because the mean of its divisors is an integer number (10819350).

Almost surely, 2^133870728 is an apocalyptic number.

It is an amenable number.

133870728 is an abundant number, since it is smaller than the sum of its proper divisors (212348472).

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

133870728 is a wasteful number, since it uses less digits than its factorization.

133870728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192381 (or 192377 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 133870728 is about 11570.2518555129. The cubic root of 133870728 is about 511.5583858881.

The spelling of 133870728 in words is "one hundred thirty-three million, eight hundred seventy thousand, seven hundred twenty-eight".