72170122844 has 24 divisors (see below), whose sum is σ = 131842626720. Its totient is φ = 34502079744.

The previous prime is 72170122837. The next prime is 72170122879. The reversal of 72170122844 is 44822107127.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 72170122798 and 72170122807.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68912 + ... + 386120.

It is an arithmetic number, because the mean of its divisors is an integer number (5493442780).

Almost surely, 2^72170122844 is an apocalyptic number.

It is an amenable number.

72170122844 is a deficient number, since it is larger than the sum of its proper divisors (59672503876).

72170122844 is a wasteful number, since it uses less digits than its factorization.

72170122844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319709 (or 319707 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 38.

The spelling of 72170122844 in words is "seventy-two billion, one hundred seventy million, one hundred twenty-two thousand, eight hundred forty-four".