128781774 has 24 divisors (see below), whose sum is σ = 304393752. Its totient is φ = 39024720.

The previous prime is 128781773. The next prime is 128781787. The reversal of 128781774 is 477187821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128781773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 325009 + ... + 325404.

It is an arithmetic number, because the mean of its divisors is an integer number (12683073).

Almost surely, 2^128781774 is an apocalyptic number.

128781774 is an abundant number, since it is smaller than the sum of its proper divisors (175611978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128781774 is a wasteful number, since it uses less digits than its factorization.

128781774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650432 (or 650429 counting only the distinct ones).

The product of its digits is 175616, while the sum is 45.

The square root of 128781774 is about 11348.2057612646. The cubic root of 128781774 is about 504.9923522679.

The spelling of 128781774 in words is "one hundred twenty-eight million, seven hundred eighty-one thousand, seven hundred seventy-four".