68634515 has 4 divisors (see below), whose sum is σ = 82361424. Its totient is φ = 54907608.

The previous prime is 68634509. The next prime is 68634521. The reversal of 68634515 is 51543686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51543686 = 2 ⋅25771843.

It is an interprime number because it is at equal distance from previous prime (68634509) and next prime (68634521).

It is a cyclic number.

It is not a de Polignac number, because 68634515 - 2⁸ = 68634259 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 6863447 + ... + 6863456.

It is an arithmetic number, because the mean of its divisors is an integer number (20590356).

Almost surely, 2^68634515 is an apocalyptic number.

68634515 is a deficient number, since it is larger than the sum of its proper divisors (13726909).

68634515 is a wasteful number, since it uses less digits than its factorization.

68634515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13726908.

The product of its digits is 86400, while the sum is 38.

The square root of 68634515 is about 8284.5950414006. The cubic root of 68634515 is about 409.4311265819.

The spelling of 68634515 in words is "sixty-eight million, six hundred thirty-four thousand, five hundred fifteen".