81302476 has 6 divisors (see below), whose sum is σ = 142279340. Its totient is φ = 40651236.

The previous prime is 81302453. The next prime is 81302497. The reversal of 81302476 is 67420318.

It is a super-2 number, since 2×81302476² = 13220185207461152, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10162806 + ... + 10162813.

Almost surely, 2^81302476 is an apocalyptic number.

It is an amenable number.

81302476 is a deficient number, since it is larger than the sum of its proper divisors (60976864).

81302476 is a wasteful number, since it uses less digits than its factorization.

81302476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20325623 (or 20325621 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 81302476 is about 9016.7885635630. The cubic root of 81302476 is about 433.2127772460.

The spelling of 81302476 in words is "eighty-one million, three hundred two thousand, four hundred seventy-six".