128007897 has 8 divisors (see below), whose sum is σ = 176183040. Its totient is φ = 82585680.

The previous prime is 128007889. The next prime is 128007907. The reversal of 128007897 is 798700821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128007897 - 2³ = 128007889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128007697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688122 + ... + 688307.

It is an arithmetic number, because the mean of its divisors is an integer number (22022880).

Almost surely, 2^128007897 is an apocalyptic number.

It is an amenable number.

128007897 is a deficient number, since it is larger than the sum of its proper divisors (48175143).

128007897 is a wasteful number, since it uses less digits than its factorization.

128007897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376463.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 128007897 is about 11314.0574949927. The cubic root of 128007897 is about 503.9787839079.

The spelling of 128007897 in words is "one hundred twenty-eight million, seven thousand, eight hundred ninety-seven".