81000806 has 8 divisors (see below), whose sum is σ = 121850400. Its totient is φ = 40384008.

The previous prime is 81000793. The next prime is 81000809. The reversal of 81000806 is 60800018.

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

It is a super-2 number, since 2×81000806² = 13122261145299272, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81000809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57326 + ... + 58721.

It is an arithmetic number, because the mean of its divisors is an integer number (15231300).

Almost surely, 2^81000806 is an apocalyptic number.

81000806 is a deficient number, since it is larger than the sum of its proper divisors (40849594).

81000806 is a wasteful number, since it uses less digits than its factorization.

81000806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116398.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 81000806 is about 9000.0447776664. The cubic root of 81000806 is about 432.6763062148.

The spelling of 81000806 in words is "eighty-one million, eight hundred six", and thus it is an aban number.