128490613 has 4 divisors (see below), whose sum is σ = 130668480. Its totient is φ = 126312748.

The previous prime is 128490589. The next prime is 128490623. The reversal of 128490613 is 316094821.

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 not a de Polignac number, because 128490613 - 2¹⁷ = 128359541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128490623) 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, 1088845 + ... + 1088962.

It is an arithmetic number, because the mean of its divisors is an integer number (32667120).

Almost surely, 2^128490613 is an apocalyptic number.

It is an amenable number.

128490613 is a deficient number, since it is larger than the sum of its proper divisors (2177867).

128490613 is an equidigital number, since it uses as much as digits as its factorization.

128490613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177866.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 128490613 is about 11335.3699983724. The cubic root of 128490613 is about 504.6114882625.

The spelling of 128490613 in words is "one hundred twenty-eight million, four hundred ninety thousand, six hundred thirteen".