87728317 has 2 divisors, whose sum is σ = 87728318. Its totient is φ = 87728316.

The previous prime is 87728287. The next prime is 87728353. The reversal of 87728317 is 71382778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84437721 + 3290596 = 9189^2 + 1814^2 .

It is a cyclic number.

It is not a de Polignac number, because 87728317 - 2²³ = 79339709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87728117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43864158 + 43864159.

It is an arithmetic number, because the mean of its divisors is an integer number (43864159).

Almost surely, 2^87728317 is an apocalyptic number.

It is an amenable number.

87728317 is a deficient number, since it is larger than the sum of its proper divisors (1).

87728317 is an equidigital number, since it uses as much as digits as its factorization.

87728317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131712, while the sum is 43.

The square root of 87728317 is about 9366.3395731737. The cubic root of 87728317 is about 444.3378056492.

The spelling of 87728317 in words is "eighty-seven million, seven hundred twenty-eight thousand, three hundred seventeen".