81774082 has 8 divisors (see below), whose sum is σ = 132096636. Its totient is φ = 37741872.

The previous prime is 81774073. The next prime is 81774101. The reversal of 81774082 is 28047718.

It can be written as a sum of positive squares in 2 ways, for example, as 81378441 + 395641 = 9021^2 + 629^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1572553 + ... + 1572604.

Almost surely, 2^81774082 is an apocalyptic number.

81774082 is a deficient number, since it is larger than the sum of its proper divisors (50322554).

81774082 is a wasteful number, since it uses less digits than its factorization.

81774082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3145172.

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

The square root of 81774082 is about 9042.9022995939. The cubic root of 81774082 is about 434.0487992584.

The spelling of 81774082 in words is "eighty-one million, seven hundred seventy-four thousand, eighty-two".