81858363 has 8 divisors (see below), whose sum is σ = 109978176. Its totient is φ = 54155400.

The previous prime is 81858353. The next prime is 81858367. The reversal of 81858363 is 36385818.

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

It is not a de Polignac number, because 81858363 - 2⁴ = 81858347 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 (81858367) 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, 103753 + ... + 104538.

It is an arithmetic number, because the mean of its divisors is an integer number (13747272).

Almost surely, 2^81858363 is an apocalyptic number.

81858363 is a deficient number, since it is larger than the sum of its proper divisors (28119813).

81858363 is a wasteful number, since it uses less digits than its factorization.

81858363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208425.

The product of its digits is 138240, while the sum is 42.

The square root of 81858363 is about 9047.5611630980. The cubic root of 81858363 is about 434.1978664824.

The spelling of 81858363 in words is "eighty-one million, eight hundred fifty-eight thousand, three hundred sixty-three".