128887373 has 6 divisors (see below), whose sum is σ = 129602382. Its totient is φ = 128176280.

The previous prime is 128887357. The next prime is 128887379. The reversal of 128887373 is 373788821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 122722084 + 6165289 = 11078^2 + 2483^2 .

It is not a de Polignac number, because 128887373 - 2⁴ = 128887357 is a prime.

It is a super-2 number, since 2×128887373² = 33223909837682258, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128887379) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34715 + ... + 38247.

It is an arithmetic number, because the mean of its divisors is an integer number (21600397).

Almost surely, 2^128887373 is an apocalyptic number.

It is an amenable number.

128887373 is a deficient number, since it is larger than the sum of its proper divisors (715009).

128887373 is an frugal number, since it uses more digits than its factorization.

128887373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3915 (or 3724 counting only the distinct ones).

The product of its digits is 451584, while the sum is 47.

The square root of 128887373 is about 11352.8574817092. The cubic root of 128887373 is about 505.1303431153.

The spelling of 128887373 in words is "one hundred twenty-eight million, eight hundred eighty-seven thousand, three hundred seventy-three".