27885697437481 has 9 divisors (see below), whose sum is σ = 30195829549431. Its totient is φ = 25740580420152.

The previous prime is 27885697437461. The next prime is 27885697437487. The reversal of 27885697437481 is 18473479658872.

The square root of 27885697437481 is 5280691.

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

It can be written as a sum of positive squares in only one way, i.e., 4125103171225 + 23760594266256 = 2031035^2 + 4874484^2 .

It is a de Polignac number, because none of the positive numbers 2^k-27885697437481 is a prime.

It is a super-2 number, since 2×27885697437481² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27885697437487) 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, 68445880 + ... + 68852086.

It is an arithmetic number, because the mean of its divisors is an integer number (3355092172159).

Almost surely, 2^{27885697437481} is an apocalyptic number.

27885697437481 is the 5280691-st square number.

27885697437481 is the 2640346-th centered octagonal number.

It is an amenable number.

27885697437481 is a deficient number, since it is larger than the sum of its proper divisors (2310132111950).

27885697437481 is an frugal number, since it uses more digits than its factorization.

27885697437481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812440 (or 406220 counting only the distinct ones).

The product of its digits is 4551966720, while the sum is 79.

The spelling of 27885697437481 in words is "twenty-seven trillion, eight hundred eighty-five billion, six hundred ninety-seven million, four hundred thirty-seven thousand, four hundred eighty-one".