128677861 has 8 divisors (see below), whose sum is σ = 145869920. Its totient is φ = 112527792.

The previous prime is 128677859. The next prime is 128677867. The reversal of 128677861 is 168776821.

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

It is not a de Polignac number, because 128677861 - 2¹ = 128677859 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 (128677867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260235 + ... + 260728.

It is an arithmetic number, because the mean of its divisors is an integer number (18233740).

Almost surely, 2^128677861 is an apocalyptic number.

It is an amenable number.

128677861 is a deficient number, since it is larger than the sum of its proper divisors (17192059).

128677861 is a wasteful number, since it uses less digits than its factorization.

128677861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520995.

The product of its digits is 225792, while the sum is 46.

The square root of 128677861 is about 11343.6264483630. The cubic root of 128677861 is about 504.8564909346.

The spelling of 128677861 in words is "one hundred twenty-eight million, six hundred seventy-seven thousand, eight hundred sixty-one".