128764578 has 16 divisors (see below), whose sum is σ = 257649696. Its totient is φ = 42901440.

The previous prime is 128764567. The next prime is 128764589. The reversal of 128764578 is 875467821.

It is an interprime number because it is at equal distance from previous prime (128764567) and next prime (128764589).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15018 + ... + 21978.

It is an arithmetic number, because the mean of its divisors is an integer number (16103106).

Almost surely, 2^128764578 is an apocalyptic number.

128764578 is an abundant number, since it is smaller than the sum of its proper divisors (128885118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128764578 is a wasteful number, since it uses less digits than its factorization.

128764578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10049.

The product of its digits is 752640, while the sum is 48.

The square root of 128764578 is about 11347.4480831595. The cubic root of 128764578 is about 504.9698743588.

The spelling of 128764578 in words is "one hundred twenty-eight million, seven hundred sixty-four thousand, five hundred seventy-eight".