87798619 has 2 divisors, whose sum is σ = 87798620. Its totient is φ = 87798618.

The previous prime is 87798587. The next prime is 87798629. The reversal of 87798619 is 91689778.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87798619 - 2⁵ = 87798587 is a prime.

It is a super-2 number, since 2×87798619² = 15417194996614322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87798619.

It is not a weakly prime, because it can be changed into another prime (87798629) 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, 43899309 + 43899310.

It is an arithmetic number, because the mean of its divisors is an integer number (43899310).

Almost surely, 2^87798619 is an apocalyptic number.

87798619 is a deficient number, since it is larger than the sum of its proper divisors (1).

87798619 is an equidigital number, since it uses as much as digits as its factorization.

87798619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 55.

The square root of 87798619 is about 9370.0917284731. The cubic root of 87798619 is about 444.4564655337.

The spelling of 87798619 in words is "eighty-seven million, seven hundred ninety-eight thousand, six hundred nineteen".