77798 has 8 divisors (see below), whose sum is σ = 133392. Its totient is φ = 33336.

The previous prime is 77797. The next prime is 77801. The reversal of 77798 is 89777.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77797) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2765 + ... + 2792.

It is an arithmetic number, because the mean of its divisors is an integer number (16674).

2⁷⁷⁷⁹⁸ is an apocalyptic number.

77798 is a deficient number, since it is larger than the sum of its proper divisors (55594).

77798 is a wasteful number, since it uses less digits than its factorization.

77798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5566.

The product of its digits is 24696, while the sum is 38.

The square root of 77798 is about 278.9229284229. The cubic root of 77798 is about 42.6896712966.

The spelling of 77798 in words is "seventy-seven thousand, seven hundred ninety-eight".