128720357 has 8 divisors (see below), whose sum is σ = 135993600. Its totient is φ = 121636144.

The previous prime is 128720321. The next prime is 128720369. The reversal of 128720357 is 753027821.

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 128720357 - 2¹⁴ = 128703973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128720387) 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, 45857 + ... + 48582.

It is an arithmetic number, because the mean of its divisors is an integer number (16999200).

Almost surely, 2^128720357 is an apocalyptic number.

It is an amenable number.

128720357 is a deficient number, since it is larger than the sum of its proper divisors (7273243).

128720357 is an equidigital number, since it uses as much as digits as its factorization.

128720357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94515.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 128720357 is about 11345.4994160680. The cubic root of 128720357 is about 504.9120612814.

The spelling of 128720357 in words is "one hundred twenty-eight million, seven hundred twenty thousand, three hundred fifty-seven".