128266457 has 16 divisors (see below), whose sum is σ = 145478592. Its totient is φ = 112057920.

The previous prime is 128266447. The next prime is 128266459. The reversal of 128266457 is 754662821.

It is a cyclic number.

It is not a de Polignac number, because 128266457 - 2⁴ = 128266441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128266459) 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, 31883 + ... + 35679.

It is an arithmetic number, because the mean of its divisors is an integer number (9092412).

Almost surely, 2^128266457 is an apocalyptic number.

It is an amenable number.

128266457 is a deficient number, since it is larger than the sum of its proper divisors (17212135).

128266457 is a wasteful number, since it uses less digits than its factorization.

128266457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3928.

The product of its digits is 161280, while the sum is 41.

The square root of 128266457 is about 11325.4782238985. The cubic root of 128266457 is about 504.3178804791.

The spelling of 128266457 in words is "one hundred twenty-eight million, two hundred sixty-six thousand, four hundred fifty-seven".