27920613 has 32 divisors (see below), whose sum is σ = 45391104. Its totient is φ = 14902272.

The previous prime is 27920609. The next prime is 27920693. The reversal of 27920613 is 31602972.

It is not a de Polignac number, because 27920613 - 2² = 27920609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27920603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70131 + ... + 70527.

It is an arithmetic number, because the mean of its divisors is an integer number (1418472).

Almost surely, 2^27920613 is an apocalyptic number.

It is an amenable number.

27920613 is a deficient number, since it is larger than the sum of its proper divisors (17470491).

27920613 is a wasteful number, since it uses less digits than its factorization.

27920613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 27920613 is about 5283.9959311112. The cubic root of 27920613 is about 303.3716425740.

The spelling of 27920613 in words is "twenty-seven million, nine hundred twenty thousand, six hundred thirteen".