81828290 has 32 divisors (see below), whose sum is σ = 151076016. Its totient is φ = 31898880.

The previous prime is 81828277. The next prime is 81828301. The reversal of 81828290 is 9282818.

It can be written as a sum of positive squares in 8 ways, for example, as 3806401 + 78021889 = 1951^2 + 8833^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95504 + ... + 96356.

Almost surely, 2^81828290 is an apocalyptic number.

81828290 is a deficient number, since it is larger than the sum of its proper divisors (69247726).

81828290 is a wasteful number, since it uses less digits than its factorization.

81828290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 81828290 is about 9045.8990708497. The cubic root of 81828290 is about 434.1446883207.

The spelling of 81828290 in words is "eighty-one million, eight hundred twenty-eight thousand, two hundred ninety".