81302468 has 24 divisors (see below), whose sum is σ = 157368792. Its totient is φ = 36509184.

The previous prime is 81302453. The next prime is 81302497. The reversal of 81302468 is 86420318.

It can be written as a sum of positive squares in 4 ways, for example, as 14684224 + 66618244 = 3832^2 + 8162^2 .

It is a super-2 number, since 2×81302468² = 13220182605782048, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19205 + ... + 23052.

It is an arithmetic number, because the mean of its divisors is an integer number (6557033).

Almost surely, 2^81302468 is an apocalyptic number.

It is an amenable number.

81302468 is a deficient number, since it is larger than the sum of its proper divisors (76066324).

81302468 is a wasteful number, since it uses less digits than its factorization.

81302468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42311 (or 42309 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 81302468 is about 9016.7881199460. The cubic root of 81302468 is about 433.2127630369.

The spelling of 81302468 in words is "eighty-one million, three hundred two thousand, four hundred sixty-eight".