27722779641 has 24 divisors (see below), whose sum is σ = 40132669824. Its totient is φ = 18440991360.

The previous prime is 27722779627. The next prime is 27722779657. The reversal of 27722779641 is 14697722772.

It is not a de Polignac number, because 27722779641 - 2¹⁰ = 27722778617 is a prime.

It is a super-2 number, since 2×27722779641² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27722779661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12827601 + ... + 12829761.

It is an arithmetic number, because the mean of its divisors is an integer number (1672194576).

Almost surely, 2^27722779641 is an apocalyptic number.

It is an amenable number.

27722779641 is a deficient number, since it is larger than the sum of its proper divisors (12409890183).

27722779641 is a wasteful number, since it uses less digits than its factorization.

27722779641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4661 (or 4658 counting only the distinct ones).

The product of its digits is 4148928, while the sum is 54.

The spelling of 27722779641 in words is "twenty-seven billion, seven hundred twenty-two million, seven hundred seventy-nine thousand, six hundred forty-one".