172442078 has 4 divisors (see below), whose sum is σ = 258663120. Its totient is φ = 86221038.

The previous prime is 172442077. The next prime is 172442093. The reversal of 172442078 is 870244271.

It is a happy number.

172442078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 870244271 = 13 ⋅66941867.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172442077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43110518 + ... + 43110521.

It is an arithmetic number, because the mean of its divisors is an integer number (64665780).

Almost surely, 2^172442078 is an apocalyptic number.

172442078 is a deficient number, since it is larger than the sum of its proper divisors (86221042).

172442078 is an equidigital number, since it uses as much as digits as its factorization.

172442078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86221041.

The product of its (nonzero) digits is 25088, while the sum is 35.

The square root of 172442078 is about 13131.7202985747. The cubic root of 172442078 is about 556.6058278298.

The spelling of 172442078 in words is "one hundred seventy-two million, four hundred forty-two thousand, seventy-eight".