68478815 has 8 divisors (see below), whose sum is σ = 84179088. Its totient is φ = 53446720.

The previous prime is 68478811. The next prime is 68478821. The reversal of 68478815 is 51887486.

It is a happy number.

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

It is not a de Polignac number, because 68478815 - 2² = 68478811 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68478815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68478811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166817 + ... + 167226.

It is an arithmetic number, because the mean of its divisors is an integer number (10522386).

Almost surely, 2^68478815 is an apocalyptic number.

68478815 is a deficient number, since it is larger than the sum of its proper divisors (15700273).

68478815 is a wasteful number, since it uses less digits than its factorization.

68478815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334089.

The product of its digits is 430080, while the sum is 47.

The square root of 68478815 is about 8275.1927469999. The cubic root of 68478815 is about 409.1212888251.

The spelling of 68478815 in words is "sixty-eight million, four hundred seventy-eight thousand, eight hundred fifteen".