128873578 has 8 divisors (see below), whose sum is σ = 198025380. Its totient is φ = 62865120.

The previous prime is 128873567. The next prime is 128873579. The reversal of 128873578 is 875378821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 109977169 + 18896409 = 10487^2 + 4347^2 .

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

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (128873579) 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, 785733 + ... + 785896.

Almost surely, 2^128873578 is an apocalyptic number.

128873578 is a deficient number, since it is larger than the sum of its proper divisors (69151802).

128873578 is a wasteful number, since it uses less digits than its factorization.

128873578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571672.

The product of its digits is 752640, while the sum is 49.

The square root of 128873578 is about 11352.2499091590. The cubic root of 128873578 is about 505.1123208645.

The spelling of 128873578 in words is "one hundred twenty-eight million, eight hundred seventy-three thousand, five hundred seventy-eight".