81760449 has 4 divisors (see below), whose sum is σ = 109013936. Its totient is φ = 54506964.

The previous prime is 81760433. The next prime is 81760453. The reversal of 81760449 is 94406718.

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 not a de Polignac number, because 81760449 - 2⁴ = 81760433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81760649) 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 3 ways as a sum of consecutive naturals, for example, 13626739 + ... + 13626744.

It is an arithmetic number, because the mean of its divisors is an integer number (27253484).

Almost surely, 2^81760449 is an apocalyptic number.

It is an amenable number.

81760449 is a deficient number, since it is larger than the sum of its proper divisors (27253487).

81760449 is a wasteful number, since it uses less digits than its factorization.

81760449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27253486.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 81760449 is about 9042.1484725700. The cubic root of 81760449 is about 434.0246770426.

The spelling of 81760449 in words is "eighty-one million, seven hundred sixty thousand, four hundred forty-nine".