27725481 has 12 divisors (see below), whose sum is σ = 45769152. Its totient is φ = 15843096.

The previous prime is 27725461. The next prime is 27725483. The reversal of 27725481 is 18452772.

It is not a de Polignac number, because 27725481 - 2⁷ = 27725353 is a prime.

It is a super-2 number, since 2×27725481² = 1537404593362722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27725483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 219981 + ... + 220106.

It is an arithmetic number, because the mean of its divisors is an integer number (3814096).

Almost surely, 2^27725481 is an apocalyptic number.

27725481 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27725481 is a deficient number, since it is larger than the sum of its proper divisors (18043671).

27725481 is a wasteful number, since it uses less digits than its factorization.

27725481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440100 (or 440097 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 27725481 is about 5265.4991216408. The cubic root of 27725481 is about 302.6632536364.

The spelling of 27725481 in words is "twenty-seven million, seven hundred twenty-five thousand, four hundred eighty-one".