27628639 has 4 divisors (see below), whose sum is σ = 27744480. Its totient is φ = 27512800.

The previous prime is 27628637. The next prime is 27628649. The reversal of 27628639 is 93682672.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27628639 - 2¹ = 27628637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27628595 and 27628604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27628631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57562 + ... + 58039.

It is an arithmetic number, because the mean of its divisors is an integer number (6936120).

Almost surely, 2^27628639 is an apocalyptic number.

27628639 is a deficient number, since it is larger than the sum of its proper divisors (115841).

27628639 is a wasteful number, since it uses less digits than its factorization.

27628639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115840.

The product of its digits is 217728, while the sum is 43.

The square root of 27628639 is about 5256.2951781649. The cubic root of 27628639 is about 302.3104529365.

The spelling of 27628639 in words is "twenty-seven million, six hundred twenty-eight thousand, six hundred thirty-nine".