81478246 has 8 divisors (see below), whose sum is σ = 129406680. Its totient is φ = 38342688.

The previous prime is 81478223. The next prime is 81478279. The reversal of 81478246 is 64287418.

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

It is a junction number, because it is equal to n+sod(n) for n = 81478199 and 81478208.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 1198176 + ... + 1198243.

It is an arithmetic number, because the mean of its divisors is an integer number (16175835).

Almost surely, 2^81478246 is an apocalyptic number.

81478246 is a deficient number, since it is larger than the sum of its proper divisors (47928434).

81478246 is a wasteful number, since it uses less digits than its factorization.

81478246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396438.

The product of its digits is 86016, while the sum is 40.

The square root of 81478246 is about 9026.5301195975. The cubic root of 81478246 is about 433.5247439721.

The spelling of 81478246 in words is "eighty-one million, four hundred seventy-eight thousand, two hundred forty-six".