428122926173 has 4 divisors (see below), whose sum is σ = 432933296220. Its totient is φ = 423312556128.

The previous prime is 428122926151. The next prime is 428122926181. The reversal of 428122926173 is 371629221824.

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

It can be written as a sum of positive squares in 2 ways, for example, as 285863454244 + 142259471929 = 534662^2 + 377173^2 .

It is a cyclic number.

It is not a de Polignac number, because 428122926173 - 2¹² = 428122922077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428122926193) 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, 2405184890 + ... + 2405185067.

It is an arithmetic number, because the mean of its divisors is an integer number (108233324055).

Almost surely, 2^428122926173 is an apocalyptic number.

It is an amenable number.

428122926173 is a deficient number, since it is larger than the sum of its proper divisors (4810370047).

428122926173 is an equidigital number, since it uses as much as digits as its factorization.

428122926173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4810370046.

The product of its digits is 580608, while the sum is 47.

The spelling of 428122926173 in words is "four hundred twenty-eight billion, one hundred twenty-two million, nine hundred twenty-six thousand, one hundred seventy-three".