27955993 has 12 divisors (see below), whose sum is σ = 30553068. Its totient is φ = 25427520.

The previous prime is 27955987. The next prime is 27955999. The reversal of 27955993 is 39955972.

27955993 = 77² + 78² + ... + 438².

It is an interprime number because it is at equal distance from previous prime (27955987) and next prime (27955999).

It can be written as a sum of positive squares in 6 ways, for example, as 2985984 + 24970009 = 1728^2 + 4997^2 .

It is not a de Polignac number, because 27955993 - 2²¹ = 25858841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27955999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154363 + ... + 154543.

It is an arithmetic number, because the mean of its divisors is an integer number (2546089).

Almost surely, 2^27955993 is an apocalyptic number.

It is an amenable number.

27955993 is a deficient number, since it is larger than the sum of its proper divisors (2597075).

27955993 is a wasteful number, since it uses less digits than its factorization.

27955993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 303 counting only the distinct ones).

The product of its digits is 765450, while the sum is 49.

The square root of 27955993 is about 5287.3427163368. The cubic root of 27955993 is about 303.4997290441.

The spelling of 27955993 in words is "twenty-seven million, nine hundred fifty-five thousand, nine hundred ninety-three".