87990837797 has 2 divisors, whose sum is σ = 87990837798. Its totient is φ = 87990837796.

The previous prime is 87990837791. The next prime is 87990837827. The reversal of 87990837797 is 79773809978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64013554081 + 23977283716 = 253009^2 + 154846^2 .

It is a cyclic number.

It is not a de Polignac number, because 87990837797 - 2²⁶ = 87923728933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87990837791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43995418898 + 43995418899.

It is an arithmetic number, because the mean of its divisors is an integer number (43995418899).

Almost surely, 2^87990837797 is an apocalyptic number.

It is an amenable number.

87990837797 is a deficient number, since it is larger than the sum of its proper divisors (1).

87990837797 is an equidigital number, since it uses as much as digits as its factorization.

87990837797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336063168, while the sum is 74.

The spelling of 87990837797 in words is "eighty-seven billion, nine hundred ninety million, eight hundred thirty-seven thousand, seven hundred ninety-seven".