81707489322 has 48 divisors (see below), whose sum is σ = 171377532576. Its totient is φ = 25963740000.

The previous prime is 81707489251. The next prime is 81707489371. The reversal of 81707489322 is 22398470718.

It is a super-2 number, since 2×81707489322² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 280572 + ... + 492072.

It is an arithmetic number, because the mean of its divisors is an integer number (3570365262).

Almost surely, 2^81707489322 is an apocalyptic number.

81707489322 is an abundant number, since it is smaller than the sum of its proper divisors (89670043254).

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

81707489322 is a wasteful number, since it uses less digits than its factorization.

81707489322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211635 (or 211604 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 51.

The spelling of 81707489322 in words is "eighty-one billion, seven hundred seven million, four hundred eighty-nine thousand, three hundred twenty-two".