128877789 has 8 divisors (see below), whose sum is σ = 173608960. Its totient is φ = 85032576.

The previous prime is 128877787. The next prime is 128877857. The reversal of 128877789 is 987778821.

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

It is not a de Polignac number, because 128877789 - 2¹ = 128877787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128877787) 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, 221149 + ... + 221730.

It is an arithmetic number, because the mean of its divisors is an integer number (21701120).

Almost surely, 2^128877789 is an apocalyptic number.

It is an amenable number.

128877789 is a deficient number, since it is larger than the sum of its proper divisors (44731171).

128877789 is an equidigital number, since it uses as much as digits as its factorization.

128877789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442979.

The product of its digits is 3161088, while the sum is 57.

The square root of 128877789 is about 11352.4353774862. The cubic root of 128877789 is about 505.1178223925.

The spelling of 128877789 in words is "one hundred twenty-eight million, eight hundred seventy-seven thousand, seven hundred eighty-nine".