68955987 has 4 divisors (see below), whose sum is σ = 91941320. Its totient is φ = 45970656.

The previous prime is 68955977. The next prime is 68956031. The reversal of 68955987 is 78955986.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 68955987 - 2¹² = 68951891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68955917) 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 in 3 ways as a sum of consecutive naturals, for example, 11492662 + ... + 11492667.

It is an arithmetic number, because the mean of its divisors is an integer number (22985330).

Almost surely, 2^68955987 is an apocalyptic number.

68955987 is a deficient number, since it is larger than the sum of its proper divisors (22985333).

68955987 is a wasteful number, since it uses less digits than its factorization.

68955987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22985332.

The product of its digits is 5443200, while the sum is 57.

The square root of 68955987 is about 8303.9741690350. The cubic root of 68955987 is about 410.0693656185.

Subtracting 68955987 from its reverse (78955986), we obtain a palindrome (9999999).

The spelling of 68955987 in words is "sixty-eight million, nine hundred fifty-five thousand, nine hundred eighty-seven".