81947482 has 8 divisors (see below), whose sum is σ = 128265696. Its totient is φ = 39192252.

The previous prime is 81947449. The next prime is 81947483. The reversal of 81947482 is 28474918.

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

It is a super-2 number, since 2×81947482² = 13430779612280648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81947483) 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, 890688 + ... + 890779.

It is an arithmetic number, because the mean of its divisors is an integer number (16033212).

Almost surely, 2^81947482 is an apocalyptic number.

81947482 is a deficient number, since it is larger than the sum of its proper divisors (46318214).

81947482 is a wasteful number, since it uses less digits than its factorization.

81947482 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781492.

The product of its digits is 129024, while the sum is 43.

The square root of 81947482 is about 9052.4848522381. The cubic root of 81947482 is about 434.3553793874.

The spelling of 81947482 in words is "eighty-one million, nine hundred forty-seven thousand, four hundred eighty-two".