28156855462722 has 24 divisors (see below), whose sum is σ = 69721737336576. Its totient is φ = 8044815846456.

The previous prime is 28156855462721. The next prime is 28156855462727. The reversal of 28156855462722 is 22726455865182.

28156855462722 is a `hidden beast` number, since 2 + 8 + 1 + 5 + 6 + 8 + 554 + 6 + 2 + 72 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 28156855462722.

It is not an unprimeable number, because it can be changed into a prime (28156855462721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111733553298 + ... + 111733553549.

It is an arithmetic number, because the mean of its divisors is an integer number (2905072389024).

Almost surely, 2^{28156855462722} is an apocalyptic number.

28156855462722 is an abundant number, since it is smaller than the sum of its proper divisors (41564881873854).

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

28156855462722 is a wasteful number, since it uses less digits than its factorization.

28156855462722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223467106862 (or 223467106859 counting only the distinct ones).

The product of its digits is 129024000, while the sum is 63.

The spelling of 28156855462722 in words is "twenty-eight trillion, one hundred fifty-six billion, eight hundred fifty-five million, four hundred sixty-two thousand, seven hundred twenty-two".