81676602 has 72 divisors (see below), whose sum is σ = 214939296. Its totient is φ = 21953664.

The previous prime is 81676597. The next prime is 81676603. The reversal of 81676602 is 20667618.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81676603) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 35293 + ... + 37535.

It is an arithmetic number, because the mean of its divisors is an integer number (2985268).

Almost surely, 2^81676602 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81676602, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107469648).

81676602 is an abundant number, since it is smaller than the sum of its proper divisors (133262694).

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

81676602 is a wasteful number, since it uses less digits than its factorization.

81676602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292 (or 2272 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 81676602 is about 9037.5108298690. The cubic root of 81676602 is about 433.8762592572.

The spelling of 81676602 in words is "eighty-one million, six hundred seventy-six thousand, six hundred two".