81690322 has 16 divisors (see below), whose sum is σ = 140274432. Its totient is φ = 34951680.

The previous prime is 81690317. The next prime is 81690373. The reversal of 81690322 is 22309618.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4423 + ... + 13525.

It is an arithmetic number, because the mean of its divisors is an integer number (8767152).

Almost surely, 2^81690322 is an apocalyptic number.

81690322 is a deficient number, since it is larger than the sum of its proper divisors (58584110).

81690322 is a wasteful number, since it uses less digits than its factorization.

81690322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9753.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 81690322 is about 9038.2698565599. The cubic root of 81690322 is about 433.9005520120.

The spelling of 81690322 in words is "eighty-one million, six hundred ninety thousand, three hundred twenty-two".