128623767 has 4 divisors (see below), whose sum is σ = 171498360. Its totient is φ = 85749176.

The previous prime is 128623741. The next prime is 128623769. The reversal of 128623767 is 767326821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 767326821 = 3 ⋅255775607.

It is a cyclic number.

It is not a de Polignac number, because 128623767 - 2¹⁹ = 128099479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128623769) 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, 21437292 + ... + 21437297.

It is an arithmetic number, because the mean of its divisors is an integer number (42874590).

Almost surely, 2^128623767 is an apocalyptic number.

128623767 is a deficient number, since it is larger than the sum of its proper divisors (42874593).

128623767 is an equidigital number, since it uses as much as digits as its factorization.

128623767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42874592.

The product of its digits is 169344, while the sum is 42.

The square root of 128623767 is about 11341.2418632176. The cubic root of 128623767 is about 504.7857366376.

The spelling of 128623767 in words is "one hundred twenty-eight million, six hundred twenty-three thousand, seven hundred sixty-seven".