128570399 has 4 divisors (see below), whose sum is σ = 128746536. Its totient is φ = 128394264.

The previous prime is 128570389. The next prime is 128570401. The reversal of 128570399 is 993075821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128570399 - 2¹⁶ = 128504863 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 (128570329) 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, 86969 + ... + 88434.

It is an arithmetic number, because the mean of its divisors is an integer number (32186634).

Almost surely, 2^128570399 is an apocalyptic number.

128570399 is a deficient number, since it is larger than the sum of its proper divisors (176137).

128570399 is an equidigital number, since it uses as much as digits as its factorization.

128570399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176136.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 128570399 is about 11338.8887903533. Note that the first 3 decimals coincide. The cubic root of 128570399 is about 504.7159124972.

The spelling of 128570399 in words is "one hundred twenty-eight million, five hundred seventy thousand, three hundred ninety-nine".