81610710 has 48 divisors (see below), whose sum is σ = 208087056. Its totient is φ = 20480512.

The previous prime is 81610709. The next prime is 81610717. The reversal of 81610710 is 1701618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81610717) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3964 + ... + 13376.

It is an arithmetic number, because the mean of its divisors is an integer number (4335147).

Almost surely, 2^81610710 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81610710, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104043528).

81610710 is an abundant number, since it is smaller than the sum of its proper divisors (126476346).

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

81610710 is a wasteful number, since it uses less digits than its factorization.

81610710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9457 (or 9440 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 24.

The square root of 81610710 is about 9033.8646215227. The cubic root of 81610710 is about 433.7595523701.

The spelling of 81610710 in words is "eighty-one million, six hundred ten thousand, seven hundred ten".