128140815 has 48 divisors (see below), whose sum is σ = 238672224. Its totient is φ = 58460160.

The previous prime is 128140801. The next prime is 128140823. The reversal of 128140815 is 518041821.

It is a happy number.

It is not a de Polignac number, because 128140815 - 2¹⁶ = 128075279 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28779 + ... + 32931.

It is an arithmetic number, because the mean of its divisors is an integer number (4972338).

Almost surely, 2^128140815 is an apocalyptic number.

128140815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128140815 is a deficient number, since it is larger than the sum of its proper divisors (110531409).

128140815 is a wasteful number, since it uses less digits than its factorization.

128140815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4200 (or 4189 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 30.

The square root of 128140815 is about 11319.9299909496. The cubic root of 128140815 is about 504.1531603361.

The spelling of 128140815 in words is "one hundred twenty-eight million, one hundred forty thousand, eight hundred fifteen".