78020345 has 8 divisors (see below), whose sum is σ = 100826376. Its totient is φ = 57614976.

The previous prime is 78020339. The next prime is 78020363. The reversal of 78020345 is 54302087.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4541161 + 73479184 = 2131^2 + 8572^2 .

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 78020345 - 2¹⁰ = 78019321 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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 600092 + ... + 600221.

It is an arithmetic number, because the mean of its divisors is an integer number (12603297).

Almost surely, 2^78020345 is an apocalyptic number.

It is an amenable number.

78020345 is a deficient number, since it is larger than the sum of its proper divisors (22806031).

78020345 is a wasteful number, since it uses less digits than its factorization.

78020345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200331.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 78020345 is about 8832.9126000431. The cubic root of 78020345 is about 427.3030133340.

The spelling of 78020345 in words is "seventy-eight million, twenty thousand, three hundred forty-five".