128212540 has 48 divisors (see below), whose sum is σ = 275409792. Its totient is φ = 50124096.

The previous prime is 128212537. The next prime is 128212573. The reversal of 128212540 is 45212821.

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, 218127 + ... + 218713.

It is an arithmetic number, because the mean of its divisors is an integer number (5737704).

Almost surely, 2^128212540 is an apocalyptic number.

128212540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128212540 is an abundant number, since it is smaller than the sum of its proper divisors (147197252).

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

128212540 is a wasteful number, since it uses less digits than its factorization.

128212540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826 (or 824 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 128212540 is about 11323.0976327152. The cubic root of 128212540 is about 504.2472069799.

The spelling of 128212540 in words is "one hundred twenty-eight million, two hundred twelve thousand, five hundred forty".