78445 has 8 divisors (see below), whose sum is σ = 97560. Its totient is φ = 60480.

The previous prime is 78439. The next prime is 78467. The reversal of 78445 is 54487.

It can be written as a sum of positive squares in 4 ways, for example, as 6084 + 72361 = 78^2 + 269^2 .

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

It is not a de Polignac number, because 78445 - 2³ = 78437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126 + ... + 415.

It is an arithmetic number, because the mean of its divisors is an integer number (12195).

2⁷⁸⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

78445 is a deficient number, since it is larger than the sum of its proper divisors (19115).

78445 is a wasteful number, since it uses less digits than its factorization.

78445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575.

The product of its digits is 4480, while the sum is 28.

The square root of 78445 is about 280.0803456153. The cubic root of 78445 is about 42.8076863361.

The spelling of 78445 in words is "seventy-eight thousand, four hundred forty-five".