81703806 has 8 divisors (see below), whose sum is σ = 163407624. Its totient is φ = 27234600.

The previous prime is 81703771. The next prime is 81703829. The reversal of 81703806 is 60830718.

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

81703806 is an admirable number.

It is a super-3 number, since 3×81703806³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6808645 + ... + 6808656.

It is an arithmetic number, because the mean of its divisors is an integer number (20425953).

Almost surely, 2^81703806 is an apocalyptic number.

81703806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81703806 is a wasteful number, since it uses less digits than its factorization.

81703806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13617306.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 81703806 is about 9039.0157650045. The cubic root of 81703806 is about 433.9244242530.

The spelling of 81703806 in words is "eighty-one million, seven hundred three thousand, eight hundred six".