78409105 has 16 divisors (see below), whose sum is σ = 101724480. Its totient is φ = 57817152.

The previous prime is 78409099. The next prime is 78409147. The reversal of 78409105 is 50190487.

It is a happy number.

It is not a de Polignac number, because 78409105 - 2⁹ = 78408593 is a prime.

It is a super-2 number, since 2×78409105² = 12295975493802050, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 7639 + ... + 14668.

It is an arithmetic number, because the mean of its divisors is an integer number (6357780).

Almost surely, 2^78409105 is an apocalyptic number.

It is an amenable number.

78409105 is a deficient number, since it is larger than the sum of its proper divisors (23315375).

78409105 is a wasteful number, since it uses less digits than its factorization.

78409105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22368.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 78409105 is about 8854.8915860105. The cubic root of 78409105 is about 428.0115600133.

The spelling of 78409105 in words is "seventy-eight million, four hundred nine thousand, one hundred five".