128863672 has 64 divisors (see below), whose sum is σ = 294174720. Its totient is φ = 51660288.

The previous prime is 128863663. The next prime is 128863717. The reversal of 128863672 is 276368821.

It is a super-2 number, since 2×128863672² = 33211691922647168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211993 + ... + 212599.

It is an arithmetic number, because the mean of its divisors is an integer number (4596480).

Almost surely, 2^128863672 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 128863672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147087360).

128863672 is an abundant number, since it is smaller than the sum of its proper divisors (165311048).

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

128863672 is a wasteful number, since it uses less digits than its factorization.

128863672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 856 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The square root of 128863672 is about 11351.8135995972. The cubic root of 128863672 is about 505.0993785403.

The spelling of 128863672 in words is "one hundred twenty-eight million, eight hundred sixty-three thousand, six hundred seventy-two".