128230857 has 12 divisors (see below), whose sum is σ = 192082800. Its totient is φ = 85487076.

The previous prime is 128230853. The next prime is 128230873. The reversal of 128230857 is 758032821.

It is not a de Polignac number, because 128230857 - 2² = 128230853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128230853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 263607 + ... + 264092.

It is an arithmetic number, because the mean of its divisors is an integer number (16006900).

Almost surely, 2^128230857 is an apocalyptic number.

It is an amenable number.

128230857 is a deficient number, since it is larger than the sum of its proper divisors (63851943).

128230857 is an frugal number, since it uses more digits than its factorization.

128230857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527714 (or 527702 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 128230857 is about 11323.9064372680. The cubic root of 128230857 is about 504.2712188181.

The spelling of 128230857 in words is "one hundred twenty-eight million, two hundred thirty thousand, eight hundred fifty-seven".