27898018729 has 27 divisors (see below), whose sum is σ = 32906488797. Its totient is φ = 23582876184.

The previous prime is 27898018727. The next prime is 27898018829. The reversal of 27898018729 is 92781089872.

The square root of 27898018729 is 167027.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 27898018729 - 2¹ = 27898018727 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27898018727) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 125103112 + ... + 125103334.

Almost surely, 2^27898018729 is an apocalyptic number.

27898018729 is the 167027-th square number.

27898018729 is the 83514-th centered octagonal number.

It is an amenable number.

27898018729 is a deficient number, since it is larger than the sum of its proper divisors (5008470068).

27898018729 is an frugal number, since it uses more digits than its factorization.

27898018729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 61.

The spelling of 27898018729 in words is "twenty-seven billion, eight hundred ninety-eight million, eighteen thousand, seven hundred twenty-nine".