27981357 has 16 divisors (see below), whose sum is σ = 39544320. Its totient is φ = 17550000.

The previous prime is 27981353. The next prime is 27981377. The reversal of 27981357 is 75318972.

It is not a de Polignac number, because 27981357 - 2² = 27981353 is a prime.

It is a super-2 number, since 2×27981357² = 1565912679122898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27981353) 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, 6982 + ... + 10232.

It is an arithmetic number, because the mean of its divisors is an integer number (2471520).

Almost surely, 2^27981357 is an apocalyptic number.

It is an amenable number.

27981357 is a deficient number, since it is larger than the sum of its proper divisors (11562963).

27981357 is a wasteful number, since it uses less digits than its factorization.

27981357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3424.

The product of its digits is 105840, while the sum is 42.

The square root of 27981357 is about 5289.7407308865. The cubic root of 27981357 is about 303.5914880243.

The spelling of 27981357 in words is "twenty-seven million, nine hundred eighty-one thousand, three hundred fifty-seven".