128385015 has 16 divisors (see below), whose sum is σ = 224090496. Its totient is φ = 62247200.

The previous prime is 128385007. The next prime is 128385017. The reversal of 128385015 is 510583821.

It is a happy number.

It is not a de Polignac number, because 128385015 - 2³ = 128385007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128385017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 388881 + ... + 389210.

It is an arithmetic number, because the mean of its divisors is an integer number (14005656).

Almost surely, 2^128385015 is an apocalyptic number.

128385015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128385015 is a deficient number, since it is larger than the sum of its proper divisors (95705481).

128385015 is a wasteful number, since it uses less digits than its factorization.

128385015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778110.

The product of its (nonzero) digits is 9600, while the sum is 33.

The square root of 128385015 is about 11330.7111427306. The cubic root of 128385015 is about 504.4732146907.

The spelling of 128385015 in words is "one hundred twenty-eight million, three hundred eighty-five thousand, fifteen".