81486442 has 8 divisors (see below), whose sum is σ = 123603300. Its totient is φ = 40285344.

The previous prime is 81486439. The next prime is 81486443. The reversal of 81486442 is 24468418.

It can be written as a sum of positive squares in 2 ways, for example, as 68244121 + 13242321 = 8261^2 + 3639^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81486443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228717 + ... + 229072.

Almost surely, 2^81486442 is an apocalyptic number.

81486442 is a deficient number, since it is larger than the sum of its proper divisors (42116858).

81486442 is a wasteful number, since it uses less digits than its factorization.

81486442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457880.

The product of its digits is 49152, while the sum is 37.

The square root of 81486442 is about 9026.9841032318. The cubic root of 81486442 is about 433.5392797525.

The spelling of 81486442 in words is "eighty-one million, four hundred eighty-six thousand, four hundred forty-two".