27730621 has 8 divisors (see below), whose sum is σ = 29451384. Its totient is φ = 26019840.

The previous prime is 27730613. The next prime is 27730627. The reversal of 27730621 is 12603772.

It can be written as a sum of positive squares in 4 ways, for example, as 4796100 + 22934521 = 2190^2 + 4789^2 .

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 27730621 - 2³ = 27730613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27730621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27730627) 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, 3691 + ... + 8311.

It is an arithmetic number, because the mean of its divisors is an integer number (3681423).

Almost surely, 2^27730621 is an apocalyptic number.

It is an amenable number.

27730621 is a deficient number, since it is larger than the sum of its proper divisors (1720763).

27730621 is a wasteful number, since it uses less digits than its factorization.

27730621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4991.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 27730621 is about 5265.9871819062. The cubic root of 27730621 is about 302.6819559629.

The spelling of 27730621 in words is "twenty-seven million, seven hundred thirty thousand, six hundred twenty-one".