8021790 has 144 divisors (see below), whose sum is σ = 25929072. Its totient is φ = 1709568.

The previous prime is 8021789. The next prime is 8021791. The reversal of 8021790 is 971208.

It is an interprime number because it is at equal distance from previous prime (8021789) and next prime (8021791).

It is a super-2 number, since 2×8021790² = 128698229608200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8021791) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 74917 + ... + 75023.

It is an arithmetic number, because the mean of its divisors is an integer number (180063).

Almost surely, 2^8021790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8021790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12964536).

8021790 is an abundant number, since it is smaller than the sum of its proper divisors (17907282).

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

8021790 is a wasteful number, since it uses less digits than its factorization.

8021790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 8021790 is about 2832.2764695559. The cubic root of 8021790 is about 200.1814187198.

Adding to 8021790 its reverse (971208), we get a palindrome (8992998).

The spelling of 8021790 in words is "eight million, twenty-one thousand, seven hundred ninety".