81447675 has 24 divisors (see below), whose sum is σ = 135537456. Its totient is φ = 43155840.

The previous prime is 81447659. The next prime is 81447701. The reversal of 81447675 is 57674418.

It is not a de Polignac number, because 81447675 - 2⁴ = 81447659 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8317 + ... + 15233.

It is an arithmetic number, because the mean of its divisors is an integer number (5647394).

Almost surely, 2^81447675 is an apocalyptic number.

81447675 is a deficient number, since it is larger than the sum of its proper divisors (54089781).

81447675 is a wasteful number, since it uses less digits than its factorization.

81447675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7087 (or 7082 counting only the distinct ones).

The product of its digits is 188160, while the sum is 42.

The square root of 81447675 is about 9024.8365636171. The cubic root of 81447675 is about 433.4705170526.

The spelling of 81447675 in words is "eighty-one million, four hundred forty-seven thousand, six hundred seventy-five".