81824282 has 4 divisors (see below), whose sum is σ = 122736426. Its totient is φ = 40912140.

The previous prime is 81824269. The next prime is 81824287. The reversal of 81824282 is 28242818.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 48288601 + 33535681 = 6949^2 + 5791^2 .

It is not an unprimeable number, because it can be changed into a prime (81824287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20456069 + ... + 20456072.

Almost surely, 2^81824282 is an apocalyptic number.

81824282 is a deficient number, since it is larger than the sum of its proper divisors (40912144).

81824282 is a wasteful number, since it uses less digits than its factorization.

81824282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40912143.

The product of its digits is 16384, while the sum is 35.

The square root of 81824282 is about 9045.6775312853. The cubic root of 81824282 is about 434.1375999803.

The spelling of 81824282 in words is "eighty-one million, eight hundred twenty-four thousand, two hundred eighty-two".