68409515 has 8 divisors (see below), whose sum is σ = 82522368. Its totient is φ = 54440320.

The previous prime is 68409503. The next prime is 68409527. The reversal of 68409515 is 51590486.

It is an interprime number because it is at equal distance from previous prime (68409503) and next prime (68409527).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-68409515 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 7 ways as a sum of consecutive naturals, for example, 34862 + ... + 36771.

It is an arithmetic number, because the mean of its divisors is an integer number (10315296).

Almost surely, 2^68409515 is an apocalyptic number.

68409515 is a deficient number, since it is larger than the sum of its proper divisors (14112853).

68409515 is a wasteful number, since it uses less digits than its factorization.

68409515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71829.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 68409515 is about 8271.0044734603. The cubic root of 68409515 is about 408.9832331129.

The spelling of 68409515 in words is "sixty-eight million, four hundred nine thousand, five hundred fifteen".