128535657 has 16 divisors (see below), whose sum is σ = 183231360. Its totient is φ = 79863552.

The previous prime is 128535637. The next prime is 128535677. The reversal of 128535657 is 756535821.

It is an interprime number because it is at equal distance from previous prime (128535637) and next prime (128535677).

It is not a de Polignac number, because 128535657 - 2⁶ = 128535593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128535637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6982 + ... + 17487.

It is an arithmetic number, because the mean of its divisors is an integer number (11451960).

Almost surely, 2^128535657 is an apocalyptic number.

128535657 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128535657 is a deficient number, since it is larger than the sum of its proper divisors (54695703).

128535657 is a wasteful number, since it uses less digits than its factorization.

128535657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24592.

The product of its digits is 252000, while the sum is 42.

The square root of 128535657 is about 11337.3567025123. The cubic root of 128535657 is about 504.6704473408.

The spelling of 128535657 in words is "one hundred twenty-eight million, five hundred thirty-five thousand, six hundred fifty-seven".