128258840 has 16 divisors (see below), whose sum is σ = 288582480. Its totient is φ = 51303520.

The previous prime is 128258831. The next prime is 128258843. The reversal of 128258840 is 48852821.

It is a junction number, because it is equal to n+sod(n) for n = 128258794 and 128258803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128258843) 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, 1603196 + ... + 1603275.

It is an arithmetic number, because the mean of its divisors is an integer number (18036405).

Almost surely, 2^128258840 is an apocalyptic number.

128258840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128258840 is an abundant number, since it is smaller than the sum of its proper divisors (160323640).

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

128258840 is a wasteful number, since it uses less digits than its factorization.

128258840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3206482 (or 3206478 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 38.

The square root of 128258840 is about 11325.1419417153. The cubic root of 128258840 is about 504.3078974447.

The spelling of 128258840 in words is "one hundred twenty-eight million, two hundred fifty-eight thousand, eight hundred forty".