81854763 has 4 divisors (see below), whose sum is σ = 109139688. Its totient is φ = 54569840.

The previous prime is 81854761. The next prime is 81854783. The reversal of 81854763 is 36745818.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81854763 - 2¹ = 81854761 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (81854761) 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, 13642458 + ... + 13642463.

It is an arithmetic number, because the mean of its divisors is an integer number (27284922).

Almost surely, 2^81854763 is an apocalyptic number.

81854763 is a deficient number, since it is larger than the sum of its proper divisors (27284925).

81854763 is a wasteful number, since it uses less digits than its factorization.

81854763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27284924.

The product of its digits is 161280, while the sum is 42.

The square root of 81854763 is about 9047.3622122694. The cubic root of 81854763 is about 434.1915012796.

The spelling of 81854763 in words is "eighty-one million, eight hundred fifty-four thousand, seven hundred sixty-three".