84778 has 16 divisors (see below), whose sum is σ = 141120. Its totient is φ = 38016.

The previous prime is 84761. The next prime is 84787. The reversal of 84778 is 87748.

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, 826 + ... + 922.

It is an arithmetic number, because the mean of its divisors is an integer number (8820).

2⁸⁴⁷⁷⁸ is an apocalyptic number.

84778 is a deficient number, since it is larger than the sum of its proper divisors (56342).

84778 is a wasteful number, since it uses less digits than its factorization.

84778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141.

The product of its digits is 12544, while the sum is 34.

The square root of 84778 is about 291.1666189658. The cubic root of 84778 is about 43.9299850667.

It can be divided in two parts, 847 and 78, that multiplied together give a palindrome (66066).

The spelling of 84778 in words is "eighty-four thousand, seven hundred seventy-eight".