27645644 has 24 divisors (see below), whose sum is σ = 53376288. Its totient is φ = 12447360.

The previous prime is 27645643. The next prime is 27645661. The reversal of 27645644 is 44654672.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 27645598 and 27645607.

It is not an unprimeable number, because it can be changed into a prime (27645643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4352 + ... + 8615.

It is an arithmetic number, because the mean of its divisors is an integer number (2224012).

Almost surely, 2^27645644 is an apocalyptic number.

It is an amenable number.

27645644 is a deficient number, since it is larger than the sum of its proper divisors (25730644).

27645644 is a wasteful number, since it uses less digits than its factorization.

27645644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13025 (or 13023 counting only the distinct ones).

The product of its digits is 161280, while the sum is 38.

The square root of 27645644 is about 5257.9125135361. The cubic root of 27645644 is about 302.3724626857.

Subtracting 27645644 from its reverse (44654672), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 27645644 in words is "twenty-seven million, six hundred forty-five thousand, six hundred forty-four".