27720740 has 12 divisors (see below), whose sum is σ = 58213596. Its totient is φ = 11088288.

The previous prime is 27720739. The next prime is 27720769. The reversal of 27720740 is 4702772.

It can be written as a sum of positive squares in 2 ways, for example, as 5837056 + 21883684 = 2416^2 + 4678^2 .

It is a super-2 number, since 2×27720740² = 1536878852295200, which contains 22 as substring.

It is an unprimeable number.

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, 692999 + ... + 693038.

It is an arithmetic number, because the mean of its divisors is an integer number (4851133).

Almost surely, 2^27720740 is an apocalyptic number.

27720740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27720740 is an abundant number, since it is smaller than the sum of its proper divisors (30492856).

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

27720740 is a wasteful number, since it uses less digits than its factorization.

27720740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386046 (or 1386044 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 29.

The square root of 27720740 is about 5265.0489076551. The cubic root of 27720740 is about 302.6460010558.

The spelling of 27720740 in words is "twenty-seven million, seven hundred twenty thousand, seven hundred forty".