133070728 has 16 divisors (see below), whose sum is σ = 285151680. Its totient is φ = 57030288.

The previous prime is 133070723. The next prime is 133070731. The reversal of 133070728 is 827070331.

It is a self number, because there is not a number n which added to its sum of digits gives 133070728.

It is not an unprimeable number, because it can be changed into a prime (133070723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1188076 + ... + 1188187.

It is an arithmetic number, because the mean of its divisors is an integer number (17821980).

Almost surely, 2^133070728 is an apocalyptic number.

It is an amenable number.

133070728 is an abundant number, since it is smaller than the sum of its proper divisors (152080952).

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

133070728 is a wasteful number, since it uses less digits than its factorization.

133070728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376276 (or 2376272 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 133070728 is about 11535.6286347992. The cubic root of 133070728 is about 510.5373395900.

The spelling of 133070728 in words is "one hundred thirty-three million, seventy thousand, seven hundred twenty-eight".