27801728 has 16 divisors (see below), whose sum is σ = 55386510. Its totient is φ = 13900800.

The previous prime is 27801721. The next prime is 27801757. The reversal of 27801728 is 82710872.

It can be written as a sum of positive squares in only one way, i.e., 27793984 + 7744 = 5272^2 + 88^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (27801721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108473 + ... + 108728.

Almost surely, 2^27801728 is an apocalyptic number.

It is an amenable number.

27801728 is a deficient number, since it is larger than the sum of its proper divisors (27584782).

27801728 is an equidigital number, since it uses as much as digits as its factorization.

27801728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217215 (or 217203 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 27801728 is about 5272.7343949795. The cubic root of 27801728 is about 302.9404480189.

The spelling of 27801728 in words is "twenty-seven million, eight hundred one thousand, seven hundred twenty-eight".