81082747 has 8 divisors (see below), whose sum is σ = 85800960. Its totient is φ = 76409640.

The previous prime is 81082723. The next prime is 81082759. The reversal of 81082747 is 74728018.

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

It is not a de Polignac number, because 81082747 - 2¹⁹ = 80558459 is a prime.

It is a super-2 number, since 2×81082747² = 13148823722132018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81082777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7543 + ... + 14800.

It is an arithmetic number, because the mean of its divisors is an integer number (10725120).

Almost surely, 2^81082747 is an apocalyptic number.

81082747 is a deficient number, since it is larger than the sum of its proper divisors (4718213).

81082747 is a wasteful number, since it uses less digits than its factorization.

81082747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22553.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 81082747 is about 9004.5958821038. The cubic root of 81082747 is about 432.8221565362.

The spelling of 81082747 in words is "eighty-one million, eighty-two thousand, seven hundred forty-seven".