87798661 has 2 divisors, whose sum is σ = 87798662. Its totient is φ = 87798660.

The previous prime is 87798649. The next prime is 87798701. The reversal of 87798661 is 16689778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67141636 + 20657025 = 8194^2 + 4545^2 .

It is a cyclic number.

It is not a de Polignac number, because 87798661 - 2⁵ = 87798629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87798599 and 87798608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87798461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43899330 + 43899331.

It is an arithmetic number, because the mean of its divisors is an integer number (43899331).

Almost surely, 2^87798661 is an apocalyptic number.

It is an amenable number.

87798661 is a deficient number, since it is larger than the sum of its proper divisors (1).

87798661 is an equidigital number, since it uses as much as digits as its factorization.

87798661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 52.

The square root of 87798661 is about 9370.0939696462. The cubic root of 87798661 is about 444.4565364048.

The spelling of 87798661 in words is "eighty-seven million, seven hundred ninety-eight thousand, six hundred sixty-one".