87997709 has 2 divisors, whose sum is σ = 87997710. Its totient is φ = 87997708.

The previous prime is 87997699. The next prime is 87997717. The reversal of 87997709 is 90779978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78676900 + 9320809 = 8870^2 + 3053^2 .

It is a cyclic number.

It is not a de Polignac number, because 87997709 - 2⁸ = 87997453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87997769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43998854 + 43998855.

It is an arithmetic number, because the mean of its divisors is an integer number (43998855).

Almost surely, 2^87997709 is an apocalyptic number.

It is an amenable number.

87997709 is a deficient number, since it is larger than the sum of its proper divisors (1).

87997709 is an equidigital number, since it uses as much as digits as its factorization.

87997709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2000376, while the sum is 56.

The square root of 87997709 is about 9380.7094081418. The cubic root of 87997709 is about 444.7921581270.

The spelling of 87997709 in words is "eighty-seven million, nine hundred ninety-seven thousand, seven hundred nine".