27921513 has 16 divisors (see below), whose sum is σ = 38511936. Its totient is φ = 17983680.

The previous prime is 27921499. The next prime is 27921521. The reversal of 27921513 is 31512972.

It is not a de Polignac number, because 27921513 - 2¹⁰ = 27920489 is a prime.

It is a super-2 number, since 2×27921513² = 1559221776418338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27921613) 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 15 ways as a sum of consecutive naturals, for example, 9343 + ... + 11963.

It is an arithmetic number, because the mean of its divisors is an integer number (2406996).

Almost surely, 2^27921513 is an apocalyptic number.

It is an amenable number.

27921513 is a deficient number, since it is larger than the sum of its proper divisors (10590423).

27921513 is a wasteful number, since it uses less digits than its factorization.

27921513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2744.

The product of its digits is 3780, while the sum is 30.

The square root of 27921513 is about 5284.0810932460. The cubic root of 27921513 is about 303.3749021913.

The spelling of 27921513 in words is "twenty-seven million, nine hundred twenty-one thousand, five hundred thirteen".