72278755228 has 24 divisors (see below), whose sum is σ = 140977141200. Its totient is φ = 32223345408.

The previous prime is 72278755217. The next prime is 72278755231. The reversal of 72278755228 is 82255787227.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27970363 + ... + 27972946.

It is an arithmetic number, because the mean of its divisors is an integer number (5874047550).

Almost surely, 2^72278755228 is an apocalyptic number.

It is an amenable number.

72278755228 is a deficient number, since it is larger than the sum of its proper divisors (68698385972).

72278755228 is a wasteful number, since it uses less digits than its factorization.

72278755228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55943349 (or 55943347 counting only the distinct ones).

The product of its digits is 8780800, while the sum is 55.

The spelling of 72278755228 in words is "seventy-two billion, two hundred seventy-eight million, seven hundred fifty-five thousand, two hundred twenty-eight".