27866626489 has 9 divisors (see below), whose sum is σ = 30177454509. Its totient is φ = 25721036640.

The previous prime is 27866626441. The next prime is 27866626531. The reversal of 27866626489 is 98462666872.

The square root of 27866626489 is 166933.

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

It can be written as a sum of positive squares in 4 ways, for example, as 4673773225 + 23192853264 = 68365^2 + 152292^2 .

It is not a de Polignac number, because 27866626489 - 2¹⁵ = 27866593721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27866626489.

It is not an unprimeable number, because it can be changed into a prime (27866626429) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2163709 + ... + 2176549.

It is an arithmetic number, because the mean of its divisors is an integer number (3353050501).

Almost surely, 2^27866626489 is an apocalyptic number.

27866626489 is the 166933-rd square number.

27866626489 is the 83467-th centered octagonal number.

It is an amenable number.

27866626489 is a deficient number, since it is larger than the sum of its proper divisors (2310828020).

27866626489 is an frugal number, since it uses more digits than its factorization.

27866626489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25708 (or 12854 counting only the distinct ones).

The product of its digits is 83607552, while the sum is 64.

Multiplying 27866626489 by its sum of digits (64), we get a square (1783464095296 = 1335464²).

The spelling of 27866626489 in words is "twenty-seven billion, eight hundred sixty-six million, six hundred twenty-six thousand, four hundred eighty-nine".