81764082 has 12 divisors (see below), whose sum is σ = 177155550. Its totient is φ = 27254688.

The previous prime is 81764071. The next prime is 81764083. The reversal of 81764082 is 28046718.

81764082 is a `hidden beast` number, since 8 + 1 + 7 + 640 + 8 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 81378441 + 385641 = 9021^2 + 621^2 .

It is not an unprimeable number, because it can be changed into a prime (81764083) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2271207 + ... + 2271242.

Almost surely, 2^81764082 is an apocalyptic number.

81764082 is an abundant number, since it is smaller than the sum of its proper divisors (95391468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81764082 is a wasteful number, since it uses less digits than its factorization.

81764082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4542457 (or 4542454 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 81764082 is about 9042.3493628592. The cubic root of 81764082 is about 434.0311055310.

The spelling of 81764082 in words is "eighty-one million, seven hundred sixty-four thousand, eighty-two".