87420017 has 2 divisors, whose sum is σ = 87420018. Its totient is φ = 87420016.

The previous prime is 87419977. The next prime is 87420049. The reversal of 87420017 is 71002478.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85082176 + 2337841 = 9224^2 + 1529^2 .

It is a cyclic number.

It is not a de Polignac number, because 87420017 - 2¹⁰ = 87418993 is a prime.

It is a Chen prime.

It is equal to p_5076083 and since 87420017 and 5076083 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (87420317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43710008 + 43710009.

It is an arithmetic number, because the mean of its divisors is an integer number (43710009).

Almost surely, 2^87420017 is an apocalyptic number.

It is an amenable number.

87420017 is a deficient number, since it is larger than the sum of its proper divisors (1).

87420017 is an equidigital number, since it uses as much as digits as its factorization.

87420017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 87420017 is about 9349.8672183085. The cubic root of 87420017 is about 443.8166887275.

The spelling of 87420017 in words is "eighty-seven million, four hundred twenty thousand, seventeen".