810221608 has 16 divisors (see below), whose sum is σ = 1736189280. Its totient is φ = 347237808.

The previous prime is 810221603. The next prime is 810221647. The reversal of 810221608 is 806122018.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (810221603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7234066 + ... + 7234177.

It is an arithmetic number, because the mean of its divisors is an integer number (108511830).

Almost surely, 2^810221608 is an apocalyptic number.

It is an amenable number.

810221608 is an abundant number, since it is smaller than the sum of its proper divisors (925967672).

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

810221608 is a wasteful number, since it uses less digits than its factorization.

810221608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14468256 (or 14468252 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 810221608 is about 28464.3919309723. The cubic root of 810221608 is about 932.2547548471.

The spelling of 810221608 in words is "eight hundred ten million, two hundred twenty-one thousand, six hundred eight".