81890686322 has 8 divisors (see below), whose sum is σ = 122838270336. Its totient is φ = 40944596212.

The previous prime is 81890686219. The next prime is 81890686357. The reversal of 81890686322 is 22368609818.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224558 + ... + 462825.

It is an arithmetic number, because the mean of its divisors is an integer number (15354783792).

Almost surely, 2^81890686322 is an apocalyptic number.

81890686322 is a deficient number, since it is larger than the sum of its proper divisors (40947584014).

81890686322 is a wasteful number, since it uses less digits than its factorization.

81890686322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746952.

The product of its (nonzero) digits is 1990656, while the sum is 53.

The spelling of 81890686322 in words is "eighty-one billion, eight hundred ninety million, six hundred eighty-six thousand, three hundred twenty-two".