128719877 has 8 divisors (see below), whose sum is σ = 151223520. Its totient is φ = 108016560.

The previous prime is 128719861. The next prime is 128719879. The reversal of 128719877 is 778917821.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 128719877 - 2⁴ = 128719861 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 (128719879) 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, 449927 + ... + 450212.

It is an arithmetic number, because the mean of its divisors is an integer number (18902940).

Almost surely, 2^128719877 is an apocalyptic number.

It is an amenable number.

128719877 is a deficient number, since it is larger than the sum of its proper divisors (22503643).

128719877 is a wasteful number, since it uses less digits than its factorization.

128719877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900163.

The product of its digits is 395136, while the sum is 50.

The square root of 128719877 is about 11345.4782622858. The cubic root of 128719877 is about 504.9114336726.

The spelling of 128719877 in words is "one hundred twenty-eight million, seven hundred nineteen thousand, eight hundred seventy-seven".