128720533 has 8 divisors (see below), whose sum is σ = 129916640. Its totient is φ = 127528560.

The previous prime is 128720519. The next prime is 128720539. The reversal of 128720533 is 335027821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128720533 - 2⁹ = 128720021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128720495 and 128720504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128720539) 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, 125563 + ... + 126583.

It is an arithmetic number, because the mean of its divisors is an integer number (16239580).

Almost surely, 2^128720533 is an apocalyptic number.

It is an amenable number.

128720533 is a deficient number, since it is larger than the sum of its proper divisors (1196107).

128720533 is a wasteful number, since it uses less digits than its factorization.

128720533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2067.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 128720533 is about 11345.5071724450. The cubic root of 128720533 is about 504.9122914042.

The spelling of 128720533 in words is "one hundred twenty-eight million, seven hundred twenty thousand, five hundred thirty-three".