81702062920 has 16 divisors (see below), whose sum is σ = 183829641660. Its totient is φ = 32680825152.

The previous prime is 81702062891. The next prime is 81702062947. The reversal of 81702062920 is 2926020718.

It can be written as a sum of positive squares in 2 ways, for example, as 80693492356 + 1008570564 = 284066^2 + 31758^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81702062920.

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, 1021275747 + ... + 1021275826.

Almost surely, 2^81702062920 is an apocalyptic number.

It is an amenable number.

81702062920 is an abundant number, since it is smaller than the sum of its proper divisors (102127578740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81702062920 is a wasteful number, since it uses less digits than its factorization.

81702062920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042551584 (or 2042551580 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 81702062920 in words is "eighty-one billion, seven hundred two million, sixty-two thousand, nine hundred twenty".