68634987 has 4 divisors (see below), whose sum is σ = 91513320. Its totient is φ = 45756656.

The previous prime is 68634971. The next prime is 68634989. The reversal of 68634987 is 78943686.

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

It is a cyclic number.

It is not a de Polignac number, because 68634987 - 2⁴ = 68634971 is a prime.

It is a super-2 number, since 2×68634987² = 9421522880980338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68634989) 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, 11439162 + ... + 11439167.

It is an arithmetic number, because the mean of its divisors is an integer number (22878330).

Almost surely, 2^68634987 is an apocalyptic number.

68634987 is a deficient number, since it is larger than the sum of its proper divisors (22878333).

68634987 is a wasteful number, since it uses less digits than its factorization.

68634987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22878332.

The product of its digits is 1741824, while the sum is 51.

The square root of 68634987 is about 8284.6235279583. The cubic root of 68634987 is about 409.4320651332.

The spelling of 68634987 in words is "sixty-eight million, six hundred thirty-four thousand, nine hundred eighty-seven".