128891592 has 48 divisors (see below), whose sum is σ = 367458000. Its totient is φ = 40702176.

The previous prime is 128891591. The next prime is 128891599. The reversal of 128891592 is 295198821.

It is a super-2 number, since 2×128891592² = 33226084976588928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128891591) 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, 45742 + ... + 48477.

It is an arithmetic number, because the mean of its divisors is an integer number (7655375).

Almost surely, 2^128891592 is an apocalyptic number.

128891592 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128891592 is an abundant number, since it is smaller than the sum of its proper divisors (238566408).

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

128891592 is a wasteful number, since it uses less digits than its factorization.

128891592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94250 (or 94243 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 128891592 is about 11353.0432924393. The cubic root of 128891592 is about 505.1358547017.

The spelling of 128891592 in words is "one hundred twenty-eight million, eight hundred ninety-one thousand, five hundred ninety-two".