128488815 has 64 divisors (see below), whose sum is σ = 281164800. Its totient is φ = 54214272.

The previous prime is 128488813. The next prime is 128488817. The reversal of 128488815 is 518884821.

It is an interprime number because it is at equal distance from previous prime (128488813) and next prime (128488817).

It is not a de Polignac number, because 128488815 - 2¹ = 128488813 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128488813) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7056 + ... + 17514.

It is an arithmetic number, because the mean of its divisors is an integer number (4393200).

Almost surely, 2^128488815 is an apocalyptic number.

128488815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128488815 is an abundant number, since it is smaller than the sum of its proper divisors (152675985).

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

128488815 is a wasteful number, since it uses less digits than its factorization.

128488815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10493 (or 10487 counting only the distinct ones).

The product of its digits is 163840, while the sum is 45.

The square root of 128488815 is about 11335.2906888178. The cubic root of 128488815 is about 504.6091345350.

The spelling of 128488815 in words is "one hundred twenty-eight million, four hundred eighty-eight thousand, eight hundred fifteen".