27428993 has 4 divisors (see below), whose sum is σ = 27546948. Its totient is φ = 27311040.

The previous prime is 27428987. The next prime is 27429011. The reversal of 27428993 is 39982472.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9042049 + 18386944 = 3007^2 + 4288^2 .

It is a cyclic number.

It is not a de Polignac number, because 27428993 - 2¹⁸ = 27166849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27428953) 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, 58628 + ... + 59093.

It is an arithmetic number, because the mean of its divisors is an integer number (6886737).

Almost surely, 2^27428993 is an apocalyptic number.

It is an amenable number.

27428993 is a deficient number, since it is larger than the sum of its proper divisors (117955).

27428993 is a wasteful number, since it uses less digits than its factorization.

27428993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117954.

The product of its digits is 217728, while the sum is 44.

The square root of 27428993 is about 5237.2696130713. The cubic root of 27428993 is about 301.5805215124.

The spelling of 27428993 in words is "twenty-seven million, four hundred twenty-eight thousand, nine hundred ninety-three".