128424057 has 4 divisors (see below), whose sum is σ = 171232080. Its totient is φ = 85616036.

The previous prime is 128424047. The next prime is 128424067. The reversal of 128424057 is 750424821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (128424047) and next prime (128424067).

It is a cyclic number.

It is not a de Polignac number, because 128424057 - 2¹¹ = 128422009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128424017) 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, 21404007 + ... + 21404012.

It is an arithmetic number, because the mean of its divisors is an integer number (42808020).

Almost surely, 2^128424057 is an apocalyptic number.

It is an amenable number.

128424057 is a deficient number, since it is larger than the sum of its proper divisors (42808023).

128424057 is an equidigital number, since it uses as much as digits as its factorization.

128424057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42808022.

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 128424057 is about 11332.4338515607. The cubic root of 128424057 is about 504.5243464294.

Adding to 128424057 its reverse (750424821), we get a palindrome (878848878).

The spelling of 128424057 in words is "one hundred twenty-eight million, four hundred twenty-four thousand, fifty-seven".