78130445 has 8 divisors (see below), whose sum is σ = 94010136. Its totient is φ = 62335296.

The previous prime is 78130399. The next prime is 78130463. The reversal of 78130445 is 54403187.

It can be written as a sum of positive squares in 4 ways, for example, as 23059204 + 55071241 = 4802^2 + 7421^2 .

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 78130445 - 2⁸ = 78130189 is a prime.

It is a super-2 number, since 2×78130445² = 12208732871796050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent 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, 19082 + ... + 22811.

It is an arithmetic number, because the mean of its divisors is an integer number (11751267).

Almost surely, 2^78130445 is an apocalyptic number.

It is an amenable number.

78130445 is a deficient number, since it is larger than the sum of its proper divisors (15879691).

78130445 is a wasteful number, since it uses less digits than its factorization.

78130445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42271.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 78130445 is about 8839.1427751791. The cubic root of 78130445 is about 427.5039179788.

The spelling of 78130445 in words is "seventy-eight million, one hundred thirty thousand, four hundred forty-five".