128891152 has 20 divisors (see below), whose sum is σ = 268936780. Its totient is φ = 59488128.

The previous prime is 128891137. The next prime is 128891153. The reversal of 128891152 is 251198821.

It can be written as a sum of positive squares in 2 ways, for example, as 67174416 + 61716736 = 8196^2 + 7856^2 .

It is a super-2 number, since 2×128891152² = 33225858127774208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128891153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309627 + ... + 310042.

It is an arithmetic number, because the mean of its divisors is an integer number (13446839).

Almost surely, 2^128891152 is an apocalyptic number.

It is an amenable number.

128891152 is an abundant number, since it is smaller than the sum of its proper divisors (140045628).

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

128891152 is a wasteful number, since it uses less digits than its factorization.

128891152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619690 (or 619684 counting only the distinct ones).

The product of its digits is 11520, while the sum is 37.

The square root of 128891152 is about 11353.0239143587. The cubic root of 128891152 is about 505.1352799033.

It can be divided in two parts, 12889 and 1152, that added together give a palindrome (14041).

The spelling of 128891152 in words is "one hundred twenty-eight million, eight hundred ninety-one thousand, one hundred fifty-two".