172422784 has 16 divisors (see below), whose sum is σ = 343498770. Its totient is φ = 86211328.

The previous prime is 172422781. The next prime is 172422787. The reversal of 172422784 is 487224271.

It is an interprime number because it is at equal distance from previous prime (172422781) and next prime (172422787).

It can be written as a sum of positive squares in only one way, i.e., 172344384 + 78400 = 13128^2 + 280^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (172422781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 673399 + ... + 673654.

Almost surely, 2^172422784 is an apocalyptic number.

It is an amenable number.

172422784 is a deficient number, since it is larger than the sum of its proper divisors (171075986).

172422784 is an equidigital number, since it uses as much as digits as its factorization.

172422784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347067 (or 1347055 counting only the distinct ones).

The product of its digits is 50176, while the sum is 37.

The square root of 172422784 is about 13130.9856446498. The cubic root of 172422784 is about 556.5850680990.

The spelling of 172422784 in words is "one hundred seventy-two million, four hundred twenty-two thousand, seven hundred eighty-four".