81701984 has 48 divisors (see below), whose sum is σ = 197977248. Its totient is φ = 32320512.

The previous prime is 81701959. The next prime is 81701987. The reversal of 81701984 is 48910718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81701987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11117 + ... + 16940.

It is an arithmetic number, because the mean of its divisors is an integer number (4124526).

Almost surely, 2^81701984 is an apocalyptic number.

It is an amenable number.

81701984 is an abundant number, since it is smaller than the sum of its proper divisors (116275264).

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

81701984 is a wasteful number, since it uses less digits than its factorization.

81701984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28087 (or 28079 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 81701984 is about 9038.9149791333. The cubic root of 81701984 is about 433.9211987151.

The spelling of 81701984 in words is "eighty-one million, seven hundred one thousand, nine hundred eighty-four".