81604710 has 96 divisors (see below), whose sum is σ = 239016960. Its totient is φ = 19137600.

The previous prime is 81604673. The next prime is 81604793. The reversal of 81604710 is 1740618.

It is a happy number.

It is a super-3 number, since 3×81604710³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 29361 + ... + 32019.

It is an arithmetic number, because the mean of its divisors is an integer number (2489760).

Almost surely, 2^81604710 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81604710, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119508480).

81604710 is an abundant number, since it is smaller than the sum of its proper divisors (157412250).

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

81604710 is a wasteful number, since it uses less digits than its factorization.

81604710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2714 (or 2711 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 81604710 is about 9033.5325316290. The cubic root of 81604710 is about 433.7489221432.

The spelling of 81604710 in words is "eighty-one million, six hundred four thousand, seven hundred ten".