27752561 has 4 divisors (see below), whose sum is σ = 27918912. Its totient is φ = 27586212.

The previous prime is 27752519. The next prime is 27752567. The reversal of 27752561 is 16525772.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 27752561 - 2⁶ = 27752497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27752567) 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, 82925 + ... + 83258.

It is an arithmetic number, because the mean of its divisors is an integer number (6979728).

Almost surely, 2^27752561 is an apocalyptic number.

It is an amenable number.

27752561 is a deficient number, since it is larger than the sum of its proper divisors (166351).

27752561 is a wasteful number, since it uses less digits than its factorization.

27752561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166350.

The product of its digits is 29400, while the sum is 35.

The square root of 27752561 is about 5268.0699501810. The cubic root of 27752561 is about 302.7617605408.

The spelling of 27752561 in words is "twenty-seven million, seven hundred fifty-two thousand, five hundred sixty-one".