27965620 has 12 divisors (see below), whose sum is σ = 58727844. Its totient is φ = 11186240.

The previous prime is 27965593. The next prime is 27965621. The reversal of 27965620 is 2656972.

It can be written as a sum of positive squares in 2 ways, for example, as 8145316 + 19820304 = 2854^2 + 4452^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 27965620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27965621) 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 3 ways as a sum of consecutive naturals, for example, 699121 + ... + 699160.

It is an arithmetic number, because the mean of its divisors is an integer number (4893987).

Almost surely, 2^27965620 is an apocalyptic number.

27965620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27965620 is an abundant number, since it is smaller than the sum of its proper divisors (30762224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27965620 is a wasteful number, since it uses less digits than its factorization.

27965620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398290 (or 1398288 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 27965620 is about 5288.2530196654. The cubic root of 27965620 is about 303.5345630368.

The spelling of 27965620 in words is "twenty-seven million, nine hundred sixty-five thousand, six hundred twenty".