81617010 has 64 divisors (see below), whose sum is σ = 202245120. Its totient is φ = 21067200.

The previous prime is 81617009. The next prime is 81617023. The reversal of 81617010 is 1071618.

It is a super-2 number, since 2×81617010² = 13322672642680200, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 194581 + ... + 194999.

It is an arithmetic number, because the mean of its divisors is an integer number (3160080).

Almost surely, 2^81617010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81617010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101122560).

81617010 is an abundant number, since it is smaller than the sum of its proper divisors (120628110).

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

81617010 is a wasteful number, since it uses less digits than its factorization.

81617010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623.

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

The square root of 81617010 is about 9034.2133027730. The cubic root of 81617010 is about 433.7707135477.

Adding to 81617010 its reverse (1071618), we get a palindrome (82688628).

The spelling of 81617010 in words is "eighty-one million, six hundred seventeen thousand, ten".