128777364 has 108 divisors (see below), whose sum is σ = 357249984. Its totient is φ = 40555728.

The previous prime is 128777293. The next prime is 128777381. The reversal of 128777364 is 463777821.

128777364 is a `hidden beast` number, since 1 + 287 + 7 + 7 + 364 = 666.

It is a tau number, because it is divible by the number of its divisors (108).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 350709 + ... + 351075.

Almost surely, 2^128777364 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128777364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178624992).

128777364 is an abundant number, since it is smaller than the sum of its proper divisors (228472620).

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

128777364 is a wasteful number, since it uses less digits than its factorization.

128777364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 391 counting only the distinct ones).

The product of its digits is 395136, while the sum is 45.

The square root of 128777364 is about 11348.0114557573. The cubic root of 128777364 is about 504.9865878868.

The spelling of 128777364 in words is "one hundred twenty-eight million, seven hundred seventy-seven thousand, three hundred sixty-four".