81578346 has 8 divisors (see below), whose sum is σ = 163156704. Its totient is φ = 27192780.

The previous prime is 81578327. The next prime is 81578383. The reversal of 81578346 is 64387518.

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

81578346 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 81578298 and 81578307.

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, 6798190 + ... + 6798201.

It is an arithmetic number, because the mean of its divisors is an integer number (20394588).

Almost surely, 2^81578346 is an apocalyptic number.

81578346 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.

81578346 is a wasteful number, since it uses less digits than its factorization.

81578346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13596396.

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

The square root of 81578346 is about 9032.0731839373. The cubic root of 81578346 is about 433.7022067503.

The spelling of 81578346 in words is "eighty-one million, five hundred seventy-eight thousand, three hundred forty-six".