81302834 has 12 divisors (see below), whose sum is σ = 126307194. Its totient is φ = 39248832.

The previous prime is 81302833. The next prime is 81302839. The reversal of 81302834 is 43820318.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 79156609 + 2146225 = 8897^2 + 1465^2 .

It is a super-2 number, since 2×81302834² = 13220301632863112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81302797 and 81302806.

It is not an unprimeable number, because it can be changed into a prime (81302831) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22487 + ... + 25850.

Almost surely, 2^81302834 is an apocalyptic number.

81302834 is a deficient number, since it is larger than the sum of its proper divisors (45004360).

81302834 is a wasteful number, since it uses less digits than its factorization.

81302834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48397 (or 48368 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 81302834 is about 9016.8084153984. The cubic root of 81302834 is about 433.2134131018.

The spelling of 81302834 in words is "eighty-one million, three hundred two thousand, eight hundred thirty-four".