81683064 has 24 divisors (see below), whose sum is σ = 221225160. Its totient is φ = 27227664.

The previous prime is 81683057. The next prime is 81683083. The reversal of 81683064 is 46038618.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 567172 + ... + 567315.

It is an arithmetic number, because the mean of its divisors is an integer number (9217715).

Almost surely, 2^81683064 is an apocalyptic number.

It is an amenable number.

81683064 is an abundant number, since it is smaller than the sum of its proper divisors (139542096).

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

81683064 is a wasteful number, since it uses less digits than its factorization.

81683064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134499 (or 1134492 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 81683064 is about 9037.8683327431. The cubic root of 81683064 is about 433.8877012712.

The spelling of 81683064 in words is "eighty-one million, six hundred eighty-three thousand, sixty-four".