81457806 has 8 divisors (see below), whose sum is σ = 162915624. Its totient is φ = 27152600.

The previous prime is 81457799. The next prime is 81457811. The reversal of 81457806 is 60875418.

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

81457806 is an admirable 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, 6788145 + ... + 6788156.

It is an arithmetic number, because the mean of its divisors is an integer number (20364453).

Almost surely, 2^81457806 is an apocalyptic number.

81457806 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.

81457806 is a wasteful number, since it uses less digits than its factorization.

81457806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13576306.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 81457806 is about 9025.3978305668. The cubic root of 81457806 is about 433.4884889499.

It can be divided in two parts, 8145 and 7806, that added together give a palindrome (15951).

The spelling of 81457806 in words is "eighty-one million, four hundred fifty-seven thousand, eight hundred six".