27913031505 has 12 divisors (see below), whose sum is σ = 48382588020. Its totient is φ = 14886950112.

The previous prime is 27913031479. The next prime is 27913031507. The reversal of 27913031505 is 50513031972.

27913031505 is a `hidden beast` number, since 2 + 7 + 91 + 30 + 31 + 505 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11108316816 + 16804714689 = 105396^2 + 129633^2 .

It is not a de Polignac number, because 27913031505 - 2⁶ = 27913031441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27913031505.

It is not an unprimeable number, because it can be changed into a prime (27913031507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310144750 + ... + 310144839.

It is an arithmetic number, because the mean of its divisors is an integer number (4031882335).

Almost surely, 2^27913031505 is an apocalyptic number.

It is an amenable number.

27913031505 is a deficient number, since it is larger than the sum of its proper divisors (20469556515).

27913031505 is a wasteful number, since it uses less digits than its factorization.

27913031505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620289600 (or 620289597 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 36.

The spelling of 27913031505 in words is "twenty-seven billion, nine hundred thirteen million, thirty-one thousand, five hundred five".