27930721 has 16 divisors (see below), whose sum is σ = 35488768. Its totient is φ = 21384000.

The previous prime is 27930719. The next prime is 27930731. The reversal of 27930721 is 12703972.

It is a cyclic number.

It is not a de Polignac number, because 27930721 - 2¹ = 27930719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a deceptive number, since it divides R_27930720.

It is not an unprimeable number, because it can be changed into a prime (27930701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2130 + ... + 7771.

It is an arithmetic number, because the mean of its divisors is an integer number (2218048).

Almost surely, 2^27930721 is an apocalyptic number.

It is an amenable number.

27930721 is a deficient number, since it is larger than the sum of its proper divisors (7558047).

27930721 is a wasteful number, since it uses less digits than its factorization.

27930721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9952.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 27930721 is about 5284.9523176657. The cubic root of 27930721 is about 303.4082476751.

The spelling of 27930721 in words is "twenty-seven million, nine hundred thirty thousand, seven hundred twenty-one".