128615 has 8 divisors (see below), whose sum is σ = 159840. Its totient is φ = 99232.

The previous prime is 128603. The next prime is 128621. The reversal of 128615 is 516821.

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 128615 - 2⁴ = 128599 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299 + ... + 588.

It is an arithmetic number, because the mean of its divisors is an integer number (19980).

2¹²⁸⁶¹⁵ is an apocalyptic number.

128615 is a deficient number, since it is larger than the sum of its proper divisors (31225).

128615 is an equidigital number, since it uses as much as digits as its factorization.

128615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921.

The product of its digits is 480, while the sum is 23.

The square root of 128615 is about 358.6293351080. The cubic root of 128615 is about 50.4774267640.

The spelling of 128615 in words is "one hundred twenty-eight thousand, six hundred fifteen".