27921385472 has 24 divisors (see below), whose sum is σ = 55829141550. Its totient is φ = 13960691712.

The previous prime is 27921385367. The next prime is 27921385477. The reversal of 27921385472 is 27458312972.

It can be written as a sum of positive squares in only one way, i.e., 20250428416 + 7670957056 = 142304^2 + 87584^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 27921385472.

It is not an unprimeable number, because it can be changed into a prime (27921385477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6814697 + ... + 6818792.

Almost surely, 2^27921385472 is an apocalyptic number.

It is an amenable number.

27921385472 is a deficient number, since it is larger than the sum of its proper divisors (27907756078).

27921385472 is an equidigital number, since it uses as much as digits as its factorization.

27921385472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13633511 (or 13633491 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 50.

The spelling of 27921385472 in words is "twenty-seven billion, nine hundred twenty-one million, three hundred eighty-five thousand, four hundred seventy-two".