78556 has 12 divisors (see below), whose sum is σ = 141120. Its totient is φ = 38240.

The previous prime is 78553. The next prime is 78569. The reversal of 78556 is 65587.

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 (78553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76 + ... + 403.

It is an arithmetic number, because the mean of its divisors is an integer number (11760).

2⁷⁸⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

78556 is a deficient number, since it is larger than the sum of its proper divisors (62564).

78556 is a wasteful number, since it uses less digits than its factorization.

78556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524 (or 522 counting only the distinct ones).

The product of its digits is 8400, while the sum is 31.

The square root of 78556 is about 280.2784329912. The cubic root of 78556 is about 42.8278678380.

Adding to 78556 its sum of digits (31), we get a palindrome (78587).

It can be divided in two parts, 785 and 56, that added together give a square (841 = 29²).

The spelling of 78556 in words is "seventy-eight thousand, five hundred fifty-six".