172888873 has 4 divisors (see below), whose sum is σ = 172920580. Its totient is φ = 172857168.

The previous prime is 172888867. The next prime is 172888879. The reversal of 172888873 is 378888271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 378888271 = 503 ⋅753257.

It is an interprime number because it is at equal distance from previous prime (172888867) and next prime (172888879).

It can be written as a sum of positive squares in 2 ways, for example, as 85877289 + 87011584 = 9267^2 + 9328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172888873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172888873.

It is not an unprimeable number, because it can be changed into a prime (172888879) 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, 5358 + ... + 19351.

It is an arithmetic number, because the mean of its divisors is an integer number (43230145).

Almost surely, 2^172888873 is an apocalyptic number.

It is an amenable number.

172888873 is a deficient number, since it is larger than the sum of its proper divisors (31707).

172888873 is an equidigital number, since it uses as much as digits as its factorization.

172888873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31706.

The product of its digits is 1204224, while the sum is 52.

The square root of 172888873 is about 13148.7213446783. The cubic root of 172888873 is about 557.0861325393.

It can be divided in two parts, 1728 and 88873, that added together give a square (90601 = 301²).

The spelling of 172888873 in words is "one hundred seventy-two million, eight hundred eighty-eight thousand, eight hundred seventy-three".