27657128 has 8 divisors (see below), whose sum is σ = 51857130. Its totient is φ = 13828560.

The previous prime is 27657121. The next prime is 27657137. The reversal of 27657128 is 82175672.

It can be written as a sum of positive squares in only one way, i.e., 18645124 + 9012004 = 4318^2 + 3002^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 27657091 and 27657100.

It is not an unprimeable number, because it can be changed into a prime (27657121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1728563 + ... + 1728578.

Almost surely, 2^27657128 is an apocalyptic number.

It is an amenable number.

27657128 is a deficient number, since it is larger than the sum of its proper divisors (24200002).

27657128 is a wasteful number, since it uses less digits than its factorization.

27657128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3457147 (or 3457143 counting only the distinct ones).

The product of its digits is 47040, while the sum is 38.

The square root of 27657128 is about 5259.0044685282. The cubic root of 27657128 is about 302.4143253947.

The spelling of 27657128 in words is "twenty-seven million, six hundred fifty-seven thousand, one hundred twenty-eight".