27405128 has 8 divisors (see below), whose sum is σ = 51384630. Its totient is φ = 13702560.

The previous prime is 27405127. The next prime is 27405137. The reversal of 27405128 is 82150472.

It can be written as a sum of positive squares in only one way, i.e., 23251684 + 4153444 = 4822^2 + 2038^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 27405128.

It is not an unprimeable number, because it can be changed into a prime (27405127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1712813 + ... + 1712828.

Almost surely, 2^27405128 is an apocalyptic number.

It is an amenable number.

27405128 is a deficient number, since it is larger than the sum of its proper divisors (23979502).

27405128 is a wasteful number, since it uses less digits than its factorization.

27405128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3425647 (or 3425643 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 27405128 is about 5234.9907354264. The cubic root of 27405128 is about 301.4930312729.

The spelling of 27405128 in words is "twenty-seven million, four hundred five thousand, one hundred twenty-eight".