27891413 has 16 divisors (see below), whose sum is σ = 31629312. Its totient is φ = 24366000.

The previous prime is 27891397. The next prime is 27891421. The reversal of 27891413 is 31419872.

27891413 = T₄₅₂ + T₄₅₃ + ... + T₆₃₇.

It is not a de Polignac number, because 27891413 - 2⁴ = 27891397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27891463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89528 + ... + 89838.

It is an arithmetic number, because the mean of its divisors is an integer number (1976832).

Almost surely, 2^27891413 is an apocalyptic number.

It is an amenable number.

27891413 is a deficient number, since it is larger than the sum of its proper divisors (3737899).

27891413 is a wasteful number, since it uses less digits than its factorization.

27891413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616.

The product of its digits is 12096, while the sum is 35.

The square root of 27891413 is about 5281.2321478988. The cubic root of 27891413 is about 303.2658480739.

The spelling of 27891413 in words is "twenty-seven million, eight hundred ninety-one thousand, four hundred thirteen".