27472561 has 4 divisors (see below), whose sum is σ = 29088612. Its totient is φ = 25856512.

The previous prime is 27472553. The next prime is 27472579. The reversal of 27472561 is 16527472.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14288400 + 13184161 = 3780^2 + 3631^2 .

It is a cyclic number.

It is not a de Polignac number, because 27472561 - 2³ = 27472553 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27472591) 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, 808000 + ... + 808033.

It is an arithmetic number, because the mean of its divisors is an integer number (7272153).

Almost surely, 2^27472561 is an apocalyptic number.

It is an amenable number.

27472561 is a deficient number, since it is larger than the sum of its proper divisors (1616051).

27472561 is a wasteful number, since it uses less digits than its factorization.

27472561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616050.

The product of its digits is 23520, while the sum is 34.

The square root of 27472561 is about 5241.4273819257. The cubic root of 27472561 is about 301.7401130989.

The spelling of 27472561 in words is "twenty-seven million, four hundred seventy-two thousand, five hundred sixty-one".