27721852816 has 20 divisors (see below), whose sum is σ = 61384102912. Its totient is φ = 11880794016.

The previous prime is 27721852813. The next prime is 27721852817. The reversal of 27721852816 is 61825812772.

It is a happy number.

It is a super-2 number, since 2×27721852816² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27721852816.

It is not an unprimeable number, because it can be changed into a prime (27721852813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123758160 + ... + 123758383.

Almost surely, 2^27721852816 is an apocalyptic number.

It is an amenable number.

27721852816 is an abundant number, since it is smaller than the sum of its proper divisors (33662250096).

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

27721852816 is a wasteful number, since it uses less digits than its factorization.

27721852816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247516558 (or 247516552 counting only the distinct ones).

The product of its digits is 752640, while the sum is 49.

The spelling of 27721852816 in words is "twenty-seven billion, seven hundred twenty-one million, eight hundred fifty-two thousand, eight hundred sixteen".