78544 has 10 divisors (see below), whose sum is σ = 152210. Its totient is φ = 39264.

The previous prime is 78541. The next prime is 78553. The reversal of 78544 is 44587.

It can be written as a sum of positive squares in only one way, i.e., 78400 + 144 = 280^2 + 12^2 .

It is a d-powerful number, because it can be written as 7³ + 8 + 5⁷ + 4 + 4³ .

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2439 + ... + 2470.

It is an arithmetic number, because the mean of its divisors is an integer number (15221).

2⁷⁸⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

78544 is a deficient number, since it is larger than the sum of its proper divisors (73666).

78544 is a wasteful number, since it uses less digits than its factorization.

78544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4917 (or 4911 counting only the distinct ones).

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

The square root of 78544 is about 280.2570248897. The cubic root of 78544 is about 42.8256869709.

The spelling of 78544 in words is "seventy-eight thousand, five hundred forty-four".