27621005 has 8 divisors (see below), whose sum is σ = 35095032. Its totient is φ = 20796928.

The previous prime is 27620977. The next prime is 27621019. The reversal of 27621005 is 50012672.

It can be written as a sum of positive squares in 4 ways, for example, as 8375236 + 19245769 = 2894^2 + 4387^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27621005 - 2⁶ = 27620941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162392 + ... + 162561.

It is an arithmetic number, because the mean of its divisors is an integer number (4386879).

Almost surely, 2^27621005 is an apocalyptic number.

It is an amenable number.

27621005 is a deficient number, since it is larger than the sum of its proper divisors (7474027).

27621005 is a wasteful number, since it uses less digits than its factorization.

27621005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324975.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 27621005 is about 5255.5689511222. The cubic root of 27621005 is about 302.2826068238.

Adding to 27621005 its sum of digits (23), we get a triangular number (27621028 = T₇₄₃₂).

Adding to 27621005 its reverse (50012672), we get a palindrome (77633677).

The spelling of 27621005 in words is "twenty-seven million, six hundred twenty-one thousand, five".