27960813 has 6 divisors (see below), whose sum is σ = 40387854. Its totient is φ = 18640536.

The previous prime is 27960809. The next prime is 27960827. The reversal of 27960813 is 31806972.

It can be written as a sum of positive squares in only one way, i.e., 22638564 + 5322249 = 4758^2 + 2307^2 .

It is not a de Polignac number, because 27960813 - 2² = 27960809 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27960613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1553370 + ... + 1553387.

It is an arithmetic number, because the mean of its divisors is an integer number (6731309).

Almost surely, 2^27960813 is an apocalyptic number.

It is an amenable number.

27960813 is a deficient number, since it is larger than the sum of its proper divisors (12427041).

27960813 is a wasteful number, since it uses less digits than its factorization.

27960813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106763 (or 3106760 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 27960813 is about 5287.7985022124. The cubic root of 27960813 is about 303.5171705593.

The spelling of 27960813 in words is "twenty-seven million, nine hundred sixty thousand, eight hundred thirteen".