81009769390 has 32 divisors (see below), whose sum is σ = 159739361280. Its totient is φ = 29334832800.

The previous prime is 81009769363. The next prime is 81009769411. The reversal of 81009769390 is 9396790018.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1514406 + ... + 1566985.

It is an arithmetic number, because the mean of its divisors is an integer number (4991855040).

Almost surely, 2^81009769390 is an apocalyptic number.

81009769390 is a deficient number, since it is larger than the sum of its proper divisors (78729591890).

81009769390 is a wasteful number, since it uses less digits than its factorization.

81009769390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3081648.

The product of its (nonzero) digits is 734832, while the sum is 52.

The spelling of 81009769390 in words is "eighty-one billion, nine million, seven hundred sixty-nine thousand, three hundred ninety".