27997525 has 12 divisors (see below), whose sum is σ = 34785472. Its totient is φ = 22353840.

The previous prime is 27997523. The next prime is 27997559. The reversal of 27997525 is 52579972.

It is not a de Polignac number, because 27997525 - 2¹ = 27997523 is a prime.

It is a super-2 number, since 2×27997525² = 1567722812251250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27997523) 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, 18964 + ... + 20386.

Almost surely, 2^27997525 is an apocalyptic number.

27997525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

27997525 is a deficient number, since it is larger than the sum of its proper divisors (6787947).

27997525 is a wasteful number, since it uses less digits than its factorization.

27997525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220 (or 2215 counting only the distinct ones).

The product of its digits is 396900, while the sum is 46.

The square root of 27997525 is about 5291.2687514433. The cubic root of 27997525 is about 303.6499498314.

The spelling of 27997525 in words is "twenty-seven million, nine hundred ninety-seven thousand, five hundred twenty-five".