27997425 has 18 divisors (see below), whose sum is σ = 50146902. Its totient is φ = 14931840.

The previous prime is 27997421. The next prime is 27997481. The reversal of 27997425 is 52479972.

It can be written as a sum of positive squares in 3 ways, for example, as 8363664 + 19633761 = 2892^2 + 4431^2 .

It is not a de Polignac number, because 27997425 - 2² = 27997421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (27997421) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 61992 + ... + 62441.

It is an arithmetic number, because the mean of its divisors is an integer number (2785939).

Almost surely, 2^27997425 is an apocalyptic number.

27997425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

27997425 is a deficient number, since it is larger than the sum of its proper divisors (22149477).

27997425 is a wasteful number, since it uses less digits than its factorization.

27997425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124449 (or 124441 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 27997425 is about 5291.2593019054. The cubic root of 27997425 is about 303.6495883110.

The spelling of 27997425 in words is "twenty-seven million, nine hundred ninety-seven thousand, four hundred twenty-five".