128280415 has 4 divisors (see below), whose sum is σ = 153936504. Its totient is φ = 102624328.

The previous prime is 128280409. The next prime is 128280421. The reversal of 128280415 is 514082821.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (128280409) and next prime (128280421).

It is a cyclic number.

It is not a de Polignac number, because 128280415 - 2¹⁹ = 127756127 is a prime.

It is a Duffinian number.

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, 12828037 + ... + 12828046.

It is an arithmetic number, because the mean of its divisors is an integer number (38484126).

Almost surely, 2^128280415 is an apocalyptic number.

128280415 is a deficient number, since it is larger than the sum of its proper divisors (25656089).

128280415 is an equidigital number, since it uses as much as digits as its factorization.

128280415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25656088.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 128280415 is about 11326.0944283544. The cubic root of 128280415 is about 504.3361731640.

The spelling of 128280415 in words is "one hundred twenty-eight million, two hundred eighty thousand, four hundred fifteen".