128064457 has 4 divisors (see below), whose sum is σ = 128924100. Its totient is φ = 127204816.

The previous prime is 128064439. The next prime is 128064463. The reversal of 128064457 is 754460821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754460821 = 37 ⋅20390833.

It can be written as a sum of positive squares in 2 ways, for example, as 72948681 + 55115776 = 8541^2 + 7424^2 .

It is a cyclic number.

It is not a de Polignac number, because 128064457 - 2¹⁵ = 128031689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128064407) 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, 429598 + ... + 429895.

It is an arithmetic number, because the mean of its divisors is an integer number (32231025).

Almost surely, 2^128064457 is an apocalyptic number.

It is an amenable number.

128064457 is a deficient number, since it is larger than the sum of its proper divisors (859643).

128064457 is an equidigital number, since it uses as much as digits as its factorization.

128064457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859642.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 128064457 is about 11316.5567643166. The cubic root of 128064457 is about 504.0530002737.

The spelling of 128064457 in words is "one hundred twenty-eight million, sixty-four thousand, four hundred fifty-seven".