81349675 has 24 divisors (see below), whose sum is σ = 116523792. Its totient is φ = 55680000.

The previous prime is 81349663. The next prime is 81349703. The reversal of 81349675 is 57694318.

It is not a de Polignac number, because 81349675 - 2¹⁷ = 81218603 is a prime.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 4026 + ... + 13375.

It is an arithmetic number, because the mean of its divisors is an integer number (4855158).

Almost surely, 2^81349675 is an apocalyptic number.

81349675 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81349675 is a deficient number, since it is larger than the sum of its proper divisors (35174117).

81349675 is a wasteful number, since it uses less digits than its factorization.

81349675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17439 (or 17434 counting only the distinct ones).

The product of its digits is 181440, while the sum is 43.

The square root of 81349675 is about 9019.4054682113. The cubic root of 81349675 is about 433.2965928745.

The spelling of 81349675 in words is "eighty-one million, three hundred forty-nine thousand, six hundred seventy-five".