81702690984 has 128 divisors (see below), whose sum is σ = 229860892800. Its totient is φ = 26887311360.

The previous prime is 81702690961. The next prime is 81702691003. The reversal of 81702690984 is 48909620718.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 81702690984.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5566984 + ... + 5581640.

It is an arithmetic number, because the mean of its divisors is an integer number (1795788225).

Almost surely, 2^81702690984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81702690984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114930446400).

81702690984 is an abundant number, since it is smaller than the sum of its proper divisors (148158201816).

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

81702690984 is a wasteful number, since it uses less digits than its factorization.

81702690984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15000 (or 14990 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 81702690984 in words is "eighty-one billion, seven hundred two million, six hundred ninety thousand, nine hundred eighty-four".