28161227072 has 28 divisors (see below), whose sum is σ = 60962657856. Its totient is φ = 12800557440.

The previous prime is 28161227053. The next prime is 28161227123. The reversal of 28161227072 is 27072216182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20000168 + ... + 20001575.

Almost surely, 2^28161227072 is an apocalyptic number.

28161227072 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28161227072 is an abundant number, since it is smaller than the sum of its proper divisors (32801430784).

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

28161227072 is a wasteful number, since it uses less digits than its factorization.

28161227072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40001766 (or 40001756 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 38.

The spelling of 28161227072 in words is "twenty-eight billion, one hundred sixty-one million, two hundred twenty-seven thousand, seventy-two".