27631945 has 16 divisors (see below), whose sum is σ = 36614592. Its totient is φ = 19850560.

The previous prime is 27631931. The next prime is 27631969. The reversal of 27631945 is 54913672.

It is not a de Polignac number, because 27631945 - 2¹³ = 27623753 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1539 + ... + 7591.

It is an arithmetic number, because the mean of its divisors is an integer number (2288412).

Almost surely, 2^27631945 is an apocalyptic number.

It is an amenable number.

27631945 is a deficient number, since it is larger than the sum of its proper divisors (8982647).

27631945 is a wasteful number, since it uses less digits than its factorization.

27631945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6152.

The product of its digits is 45360, while the sum is 37.

The square root of 27631945 is about 5256.6096488136. The cubic root of 27631945 is about 302.3225104553.

The spelling of 27631945 in words is "twenty-seven million, six hundred thirty-one thousand, nine hundred forty-five".