81568246 has 4 divisors (see below), whose sum is σ = 122352372. Its totient is φ = 40784122.

The previous prime is 81568231. The next prime is 81568247. The reversal of 81568246 is 64286518.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 81568199 and 81568208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81568247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20392060 + ... + 20392063.

It is an arithmetic number, because the mean of its divisors is an integer number (30588093).

Almost surely, 2^81568246 is an apocalyptic number.

81568246 is a deficient number, since it is larger than the sum of its proper divisors (40784126).

81568246 is a wasteful number, since it uses less digits than its factorization.

81568246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40784125.

The product of its digits is 92160, while the sum is 40.

The square root of 81568246 is about 9031.5140480431. The cubic root of 81568246 is about 433.6843075026.

The spelling of 81568246 in words is "eighty-one million, five hundred sixty-eight thousand, two hundred forty-six".