81702170480 has 40 divisors (see below), whose sum is σ = 217094340192. Its totient is φ = 28012172544.

The previous prime is 81702170477. The next prime is 81702170489. The reversal of 81702170480 is 8407120718.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×81702170480² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81702170489) by changing a digit.

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, 72947807 + ... + 72948926.

Almost surely, 2^81702170480 is an apocalyptic number.

81702170480 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81702170480 is an abundant number, since it is smaller than the sum of its proper divisors (135392169712).

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

81702170480 is a wasteful number, since it uses less digits than its factorization.

81702170480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145896753 (or 145896747 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 38.

The spelling of 81702170480 in words is "eighty-one billion, seven hundred two million, one hundred seventy thousand, four hundred eighty".