128487613 has 4 divisors (see below), whose sum is σ = 131221440. Its totient is φ = 125753788.

The previous prime is 128487599. The next prime is 128487641. The reversal of 128487613 is 316784821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128487613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128487673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1366843 + ... + 1366936.

It is an arithmetic number, because the mean of its divisors is an integer number (32805360).

Almost surely, 2^128487613 is an apocalyptic number.

It is an amenable number.

128487613 is a deficient number, since it is larger than the sum of its proper divisors (2733827).

128487613 is an equidigital number, since it uses as much as digits as its factorization.

128487613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2733826.

The product of its digits is 64512, while the sum is 40.

The square root of 128487613 is about 11335.2376684391. The cubic root of 128487613 is about 504.6075610074.

The spelling of 128487613 in words is "one hundred twenty-eight million, four hundred eighty-seven thousand, six hundred thirteen".