27213945 has 64 divisors (see below), whose sum is σ = 50761728. Its totient is φ = 12320000.

The previous prime is 27213943. The next prime is 27213959. The reversal of 27213945 is 54931272.

It is not a de Polignac number, because 27213945 - 2¹ = 27213943 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (27213943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 269395 + ... + 269495.

It is an arithmetic number, because the mean of its divisors is an integer number (793152).

Almost surely, 2^27213945 is an apocalyptic number.

It is an amenable number.

27213945 is a deficient number, since it is larger than the sum of its proper divisors (23547783).

27213945 is a wasteful number, since it uses less digits than its factorization.

27213945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214.

The product of its digits is 15120, while the sum is 33.

The square root of 27213945 is about 5216.6986686984. The cubic root of 27213945 is about 300.7903051201.

It can be divided in two parts, 2721 and 3945, that added together give a palindrome (6666).

The spelling of 27213945 in words is "twenty-seven million, two hundred thirteen thousand, nine hundred forty-five".