27720720 has 60 divisors (see below), whose sum is σ = 93097836. Its totient is φ = 7392000.

The previous prime is 27720703. The next prime is 27720739. The reversal of 27720720 is 2702772.

It can be written as a sum of positive squares in 2 ways, for example, as 15776784 + 11943936 = 3972^2 + 3456^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18531 + ... + 19970.

Almost surely, 2^27720720 is an apocalyptic number.

27720720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27720720 is an abundant number, since it is smaller than the sum of its proper divisors (65377116).

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

27720720 is a wasteful number, since it uses less digits than its factorization.

27720720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38520 (or 38511 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 27.

The square root of 27720720 is about 5265.0470083372. The cubic root of 27720720 is about 302.6459282713.

The spelling of 27720720 in words is "twenty-seven million, seven hundred twenty thousand, seven hundred twenty".