81008208 has 160 divisors (see below), whose sum is σ = 251412480. Its totient is φ = 24900480.

The previous prime is 81008201. The next prime is 81008209. The reversal of 81008208 is 80280018.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81008201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 307885 + ... + 308147.

It is an arithmetic number, because the mean of its divisors is an integer number (1571328).

Almost surely, 2^81008208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81008208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125706240).

81008208 is an abundant number, since it is smaller than the sum of its proper divisors (170404272).

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

81008208 is a wasteful number, since it uses less digits than its factorization.

81008208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 81008208 is about 9000.4559884486. The cubic root of 81008208 is about 432.6894853942.

The spelling of 81008208 in words is "eighty-one million, eight thousand, two hundred eight".