128770869 has 32 divisors (see below), whose sum is σ = 190218240. Its totient is φ = 77126400.

The previous prime is 128770793. The next prime is 128770871. The reversal of 128770869 is 968077821.

It is not a de Polignac number, because 128770869 - 2²⁴ = 111993653 is a prime.

It is a super-2 number, since 2×128770869² = 33163873406030322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128770769) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124384 + ... + 125414.

It is an arithmetic number, because the mean of its divisors is an integer number (5944320).

Almost surely, 2^128770869 is an apocalyptic number.

It is an amenable number.

128770869 is a deficient number, since it is larger than the sum of its proper divisors (61447371).

128770869 is a wasteful number, since it uses less digits than its factorization.

128770869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161.

The product of its (nonzero) digits is 338688, while the sum is 48.

The square root of 128770869 is about 11347.7252786627. The cubic root of 128770869 is about 504.9780979293.

The spelling of 128770869 in words is "one hundred twenty-eight million, seven hundred seventy thousand, eight hundred sixty-nine".