81402082 has 8 divisors (see below), whose sum is σ = 122339052. Its totient is φ = 40622400.

The previous prime is 81402077. The next prime is 81402089. The reversal of 81402082 is 28020418.

It can be written as a sum of positive squares in 2 ways, for example, as 80838081 + 564001 = 8991^2 + 751^2 .

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 (81402089) 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, 38019 + ... + 40102.

Almost surely, 2^81402082 is an apocalyptic number.

81402082 is a deficient number, since it is larger than the sum of its proper divisors (40936970).

81402082 is a wasteful number, since it uses less digits than its factorization.

81402082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78644.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 81402082 is about 9022.3102362976. The cubic root of 81402082 is about 433.3896188558.

The spelling of 81402082 in words is "eighty-one million, four hundred two thousand, eighty-two".