27801380 has 12 divisors (see below), whose sum is σ = 58382940. Its totient is φ = 11120544.

The previous prime is 27801379. The next prime is 27801407. The reversal of 27801380 is 8310872.

It can be written as a sum of positive squares in 2 ways, for example, as 10445824 + 17355556 = 3232^2 + 4166^2 .

It is a super-4 number, since 4×27801380⁴ (a number of 31 digits) contains 4444 as substring.

It is a plaindrome in base 14.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 695015 + ... + 695054.

It is an arithmetic number, because the mean of its divisors is an integer number (4865245).

Almost surely, 2^27801380 is an apocalyptic number.

27801380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27801380 is an abundant number, since it is smaller than the sum of its proper divisors (30581560).

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

27801380 is a wasteful number, since it uses less digits than its factorization.

27801380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390078 (or 1390076 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 27801380 is about 5272.7013949208. The cubic root of 27801380 is about 302.9391840241.

The spelling of 27801380 in words is "twenty-seven million, eight hundred one thousand, three hundred eighty".