68987509 has 2 divisors, whose sum is σ = 68987510. Its totient is φ = 68987508.

The previous prime is 68987473. The next prime is 68987519. The reversal of 68987509 is 90578986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48692484 + 20295025 = 6978^2 + 4505^2 .

It is a cyclic number.

It is not a de Polignac number, because 68987509 - 2¹⁵ = 68954741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68987519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34493754 + 34493755.

It is an arithmetic number, because the mean of its divisors is an integer number (34493755).

Almost surely, 2^68987509 is an apocalyptic number.

It is an amenable number.

68987509 is a deficient number, since it is larger than the sum of its proper divisors (1).

68987509 is an equidigital number, since it uses as much as digits as its factorization.

68987509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The square root of 68987509 is about 8305.8719590420. The cubic root of 68987509 is about 410.1318413993.

It can be divided in two parts, 68987 and 509, that added together give a palindrome (69496).

The spelling of 68987509 in words is "sixty-eight million, nine hundred eighty-seven thousand, five hundred nine".