27431641 has 4 divisors (see below), whose sum is σ = 27504400. Its totient is φ = 27358884.

The previous prime is 27431629. The next prime is 27431653. The reversal of 27431641 is 14613472.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (27431629) and next prime (27431653).

It is a cyclic number.

It is not a de Polignac number, because 27431641 - 2²³ = 19043033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27431671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35811 + ... + 36568.

It is an arithmetic number, because the mean of its divisors is an integer number (6876100).

Almost surely, 2^27431641 is an apocalyptic number.

27431641 is the 3313-rd centered pentagonal number.

It is an amenable number.

27431641 is a deficient number, since it is larger than the sum of its proper divisors (72759).

27431641 is an equidigital number, since it uses as much as digits as its factorization.

27431641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72758.

The product of its digits is 4032, while the sum is 28.

The square root of 27431641 is about 5237.5224104532. The cubic root of 27431641 is about 301.5902260797.

The spelling of 27431641 in words is "twenty-seven million, four hundred thirty-one thousand, six hundred forty-one".