128521140 has 48 divisors (see below), whose sum is σ = 392575680. Its totient is φ = 31156480.

The previous prime is 128521117. The next prime is 128521177. The reversal of 128521140 is 41125821.

It is a self number, because there is not a number n which added to its sum of digits gives 128521140.

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, 96705 + ... + 98024.

It is an arithmetic number, because the mean of its divisors is an integer number (8178660).

Almost surely, 2^128521140 is an apocalyptic number.

128521140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128521140 is an abundant number, since it is smaller than the sum of its proper divisors (264054540).

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

128521140 is a wasteful number, since it uses less digits than its factorization.

128521140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194752 (or 194750 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 128521140 is about 11336.7164558350. The cubic root of 128521140 is about 504.6514472260.

Adding to 128521140 its reverse (41125821), we get a palindrome (169646961).

The spelling of 128521140 in words is "one hundred twenty-eight million, five hundred twenty-one thousand, one hundred forty".