128370805 has 4 divisors (see below), whose sum is σ = 154044972. Its totient is φ = 102696640.

The previous prime is 128370799. The next prime is 128370833. The reversal of 128370805 is 508073821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508073821 = 787 ⋅645583.

It can be written as a sum of positive squares in 2 ways, for example, as 62078641 + 66292164 = 7879^2 + 8142^2 .

It is not a de Polignac number, because 128370805 - 2¹⁹ = 127846517 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, 12837076 + ... + 12837085.

It is an arithmetic number, because the mean of its divisors is an integer number (38511243).

Almost surely, 2^128370805 is an apocalyptic number.

It is an amenable number.

128370805 is a deficient number, since it is larger than the sum of its proper divisors (25674167).

128370805 is an equidigital number, since it uses as much as digits as its factorization.

128370805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25674166.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 128370805 is about 11330.0840685319. The cubic root of 128370805 is about 504.4546018516.

The spelling of 128370805 in words is "one hundred twenty-eight million, three hundred seventy thousand, eight hundred five".