128207457 has 12 divisors (see below), whose sum is σ = 211644160. Its totient is φ = 73261368.

The previous prime is 128207447. The next prime is 128207509. The reversal of 128207457 is 754702821.

It is not a de Polignac number, because 128207457 - 2¹⁶ = 128141921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128207407) 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, 1017457 + ... + 1017582.

Almost surely, 2^128207457 is an apocalyptic number.

It is an amenable number.

128207457 is a deficient number, since it is larger than the sum of its proper divisors (83436703).

128207457 is a wasteful number, since it uses less digits than its factorization.

128207457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035052 (or 2035049 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 128207457 is about 11322.8731777760. The cubic root of 128207457 is about 504.2405432468.

The spelling of 128207457 in words is "one hundred twenty-eight million, two hundred seven thousand, four hundred fifty-seven".