172878156 has 72 divisors (see below), whose sum is σ = 485778384. Its totient is φ = 51392640.

The previous prime is 172878137. The next prime is 172878161. The reversal of 172878156 is 651878271.

It is a happy number.

172878156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16870 + ... + 25106.

It is an arithmetic number, because the mean of its divisors is an integer number (6746922).

Almost surely, 2^172878156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172878156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242889192).

172878156 is an abundant number, since it is smaller than the sum of its proper divisors (312900228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172878156 is a wasteful number, since it uses less digits than its factorization.

172878156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8311 (or 8306 counting only the distinct ones).

The product of its digits is 188160, while the sum is 45.

The square root of 172878156 is about 13148.3138082417. The cubic root of 172878156 is about 557.0746214544.

The spelling of 172878156 in words is "one hundred seventy-two million, eight hundred seventy-eight thousand, one hundred fifty-six".