810217980 has 144 divisors (see below), whose sum is σ = 2887413984. Its totient is φ = 181301760.

The previous prime is 810217973. The next prime is 810217999. The reversal of 810217980 is 89712018.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10002 + ... + 41478.

It is an arithmetic number, because the mean of its divisors is an integer number (20051486).

Almost surely, 2^810217980 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 810217980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1443706992).

810217980 is an abundant number, since it is smaller than the sum of its proper divisors (2077196004).

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

810217980 is a wasteful number, since it uses less digits than its factorization.

810217980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31516 (or 31511 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 810217980 is about 28464.3282021551. The cubic root of 810217980 is about 932.2533633656.

Adding to 810217980 its reverse (89712018), we get a palindrome (899929998).

The spelling of 810217980 in words is "eight hundred ten million, two hundred seventeen thousand, nine hundred eighty".