81608175 has 96 divisors (see below), whose sum is σ = 169632000. Its totient is φ = 38102400.

The previous prime is 81608167. The next prime is 81608183. The reversal of 81608175 is 57180618.

It is an interprime number because it is at equal distance from previous prime (81608167) and next prime (81608183).

It is not a de Polignac number, because 81608175 - 2³ = 81608167 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 215136 + ... + 215514.

It is an arithmetic number, because the mean of its divisors is an integer number (1767000).

Almost surely, 2^81608175 is an apocalyptic number.

81608175 is an abundant number, since it is smaller than the sum of its proper divisors (88023825).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81608175 is a wasteful number, since it uses less digits than its factorization.

81608175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 81608175 is about 9033.7243150320. The cubic root of 81608175 is about 433.7550611628.

The spelling of 81608175 in words is "eighty-one million, six hundred eight thousand, one hundred seventy-five".