78409122 has 16 divisors (see below), whose sum is σ = 171074592. Its totient is φ = 23760320.

The previous prime is 78409099. The next prime is 78409147. The reversal of 78409122 is 22190487.

It is a happy number.

It is a super-2 number, since 2×78409122² = 12295980825621768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 593943 + ... + 594074.

It is an arithmetic number, because the mean of its divisors is an integer number (10692162).

Almost surely, 2^78409122 is an apocalyptic number.

78409122 is an abundant number, since it is smaller than the sum of its proper divisors (92665470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78409122 is a wasteful number, since it uses less digits than its factorization.

78409122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188033.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 78409122 is about 8854.8925459319. The cubic root of 78409122 is about 428.0115909459.

The spelling of 78409122 in words is "seventy-eight million, four hundred nine thousand, one hundred twenty-two".