27720993 has 8 divisors (see below), whose sum is σ = 36986656. Its totient is φ = 18468000.

The previous prime is 27720983. The next prime is 27720997. The reversal of 27720993 is 39902772.

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

It is not a de Polignac number, because 27720993 - 2¹⁴ = 27704609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27720997) 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, 4818 + ... + 8868.

It is an arithmetic number, because the mean of its divisors is an integer number (4623332).

Almost surely, 2^27720993 is an apocalyptic number.

It is an amenable number.

27720993 is a deficient number, since it is larger than the sum of its proper divisors (9265663).

27720993 is a wasteful number, since it uses less digits than its factorization.

27720993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6335.

The product of its (nonzero) digits is 47628, while the sum is 39.

The square root of 27720993 is about 5265.0729339678. The cubic root of 27720993 is about 302.6469217768.

The spelling of 27720993 in words is "twenty-seven million, seven hundred twenty thousand, nine hundred ninety-three".