87750217 has 2 divisors, whose sum is σ = 87750218. Its totient is φ = 87750216.

The previous prime is 87750197. The next prime is 87750239. The reversal of 87750217 is 71205778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86787856 + 962361 = 9316^2 + 981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87750217 is a prime.

It is not a weakly prime, because it can be changed into another prime (87750017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43875108 + 43875109.

It is an arithmetic number, because the mean of its divisors is an integer number (43875109).

Almost surely, 2^87750217 is an apocalyptic number.

It is an amenable number.

87750217 is a deficient number, since it is larger than the sum of its proper divisors (1).

87750217 is an equidigital number, since it uses as much as digits as its factorization.

87750217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 87750217 is about 9367.5085801936. The cubic root of 87750217 is about 444.3747765637.

The spelling of 87750217 in words is "eighty-seven million, seven hundred fifty thousand, two hundred seventeen".