128763331 has 4 divisors (see below), whose sum is σ = 130210200. Its totient is φ = 127316464.

The previous prime is 128763307. The next prime is 128763359. The reversal of 128763331 is 133367821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128763331 is a prime.

It is a super-2 number, since 2×128763331² = 33159990820431122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128763301) 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, 723301 + ... + 723478.

It is an arithmetic number, because the mean of its divisors is an integer number (32552550).

Almost surely, 2^128763331 is an apocalyptic number.

128763331 is a deficient number, since it is larger than the sum of its proper divisors (1446869).

128763331 is an equidigital number, since it uses as much as digits as its factorization.

128763331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446868.

The product of its digits is 18144, while the sum is 34.

The square root of 128763331 is about 11347.3931367517. The cubic root of 128763331 is about 504.9682442535.

The spelling of 128763331 in words is "one hundred twenty-eight million, seven hundred sixty-three thousand, three hundred thirty-one".