81815346 has 20 divisors (see below), whose sum is σ = 183327342. Its totient is φ = 27271728.

The previous prime is 81815309. The next prime is 81815381. The reversal of 81815346 is 64351818.

It can be written as a sum of positive squares in only one way, i.e., 49154121 + 32661225 = 7011^2 + 5715^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81815346.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 252355 + ... + 252678.

Almost surely, 2^81815346 is an apocalyptic number.

81815346 is an abundant number, since it is smaller than the sum of its proper divisors (101511996).

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

81815346 is a wasteful number, since it uses less digits than its factorization.

81815346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505047 (or 505038 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 81815346 is about 9045.1835802266. The cubic root of 81815346 is about 434.1217954019.

The spelling of 81815346 in words is "eighty-one million, eight hundred fifteen thousand, three hundred forty-six".