128279240 has 32 divisors (see below), whose sum is σ = 297941760. Its totient is φ = 49656000.

The previous prime is 128279233. The next prime is 128279269. The reversal of 128279240 is 42972821.

It is a self number, because there is not a number n which added to its sum of digits gives 128279240.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50486 + ... + 52965.

It is an arithmetic number, because the mean of its divisors is an integer number (9310680).

Almost surely, 2^128279240 is an apocalyptic number.

128279240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128279240 is an abundant number, since it is smaller than the sum of its proper divisors (169662520).

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

128279240 is a wasteful number, since it uses less digits than its factorization.

128279240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103493 (or 103489 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 128279240 is about 11326.0425568687. The cubic root of 128279240 is about 504.3346333165.

The spelling of 128279240 in words is "one hundred twenty-eight million, two hundred seventy-nine thousand, two hundred forty".