81675005 has 8 divisors (see below), whose sum is σ = 98145024. Its totient is φ = 65250000.

The previous prime is 81674981. The next prime is 81675007. The reversal of 81675005 is 50057618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81675005 - 2¹⁰ = 81673981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81675007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7121 + ... + 14630.

It is an arithmetic number, because the mean of its divisors is an integer number (12268128).

Almost surely, 2^81675005 is an apocalyptic number.

It is an amenable number.

81675005 is a deficient number, since it is larger than the sum of its proper divisors (16470019).

81675005 is a wasteful number, since it uses less digits than its factorization.

81675005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22507.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 81675005 is about 9037.4224754628. The cubic root of 81675005 is about 433.8734314180.

The spelling of 81675005 in words is "eighty-one million, six hundred seventy-five thousand, five".