8790872821 has 2 divisors, whose sum is σ = 8790872822. Its totient is φ = 8790872820.

The previous prime is 8790872813. The next prime is 8790872837. The reversal of 8790872821 is 1282780978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7819864900 + 971007921 = 88430^2 + 31161^2 .

It is a cyclic number.

It is not a de Polignac number, because 8790872821 - 2³ = 8790872813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8790872221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4395436410 + 4395436411.

It is an arithmetic number, because the mean of its divisors is an integer number (4395436411).

Almost surely, 2^8790872821 is an apocalyptic number.

It is an amenable number.

8790872821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8790872821 is an equidigital number, since it uses as much as digits as its factorization.

8790872821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903168, while the sum is 52.

The square root of 8790872821 is about 93759.6545482117. The cubic root of 8790872821 is about 2063.8462108644.

The spelling of 8790872821 in words is "eight billion, seven hundred ninety million, eight hundred seventy-two thousand, eight hundred twenty-one".