128219540 has 12 divisors (see below), whose sum is σ = 269261076. Its totient is φ = 51287808.

The previous prime is 128219519. The next prime is 128219551. The reversal of 128219540 is 45912821.

It can be written as a sum of positive squares in 2 ways, for example, as 93973636 + 34245904 = 9694^2 + 5852^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128219497 and 128219506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3205469 + ... + 3205508.

It is an arithmetic number, because the mean of its divisors is an integer number (22438423).

Almost surely, 2^128219540 is an apocalyptic number.

128219540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128219540 is an abundant number, since it is smaller than the sum of its proper divisors (141041536).

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

128219540 is a wasteful number, since it uses less digits than its factorization.

128219540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6410986 (or 6410984 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 128219540 is about 11323.4067311918. The cubic root of 128219540 is about 504.2563835815.

The spelling of 128219540 in words is "one hundred twenty-eight million, two hundred nineteen thousand, five hundred forty".