78158105 has 8 divisors (see below), whose sum is σ = 93837192. Its totient is φ = 62494848.

The previous prime is 78158081. The next prime is 78158111. The reversal of 78158105 is 50185187.

It can be written as a sum of positive squares in 4 ways, for example, as 30327049 + 47831056 = 5507^2 + 6916^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 78158105 - 2¹² = 78154009 is a prime.

It is a super-2 number, since 2×78158105² = 12217378754382050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17237 + ... + 21293.

It is an arithmetic number, because the mean of its divisors is an integer number (11729649).

Almost surely, 2^78158105 is an apocalyptic number.

It is an amenable number.

78158105 is a deficient number, since it is larger than the sum of its proper divisors (15679087).

78158105 is a wasteful number, since it uses less digits than its factorization.

78158105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7915.

The product of its (nonzero) digits is 11200, while the sum is 35.

The square root of 78158105 is about 8840.7072680866. The cubic root of 78158105 is about 427.5543608129.

The spelling of 78158105 in words is "seventy-eight million, one hundred fifty-eight thousand, one hundred five".