128389677 has 8 divisors (see below), whose sum is σ = 184354464. Its totient is φ = 79009008.

The previous prime is 128389649. The next prime is 128389697. The reversal of 128389677 is 776983821.

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

It is not a de Polignac number, because 128389677 - 2¹⁸ = 128127533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128389637) 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, 1645983 + ... + 1646060.

It is an arithmetic number, because the mean of its divisors is an integer number (23044308).

Almost surely, 2^128389677 is an apocalyptic number.

It is an amenable number.

128389677 is a deficient number, since it is larger than the sum of its proper divisors (55964787).

128389677 is a wasteful number, since it uses less digits than its factorization.

128389677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3292059.

The product of its digits is 1016064, while the sum is 51.

The square root of 128389677 is about 11330.9168649320. The cubic root of 128389677 is about 504.4793208697.

The spelling of 128389677 in words is "one hundred twenty-eight million, three hundred eighty-nine thousand, six hundred seventy-seven".