79778 has 8 divisors (see below), whose sum is σ = 121068. Its totient is φ = 39424.

The previous prime is 79777. The next prime is 79801. The reversal of 79778 is 87797.

It can be written as a sum of positive squares in 2 ways, for example, as 69169 + 10609 = 263^2 + 103^2 .

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 (79777) 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, 50 + ... + 402.

2⁷⁹⁷⁷⁸ is an apocalyptic number.

79778 is a deficient number, since it is larger than the sum of its proper divisors (41290).

79778 is a wasteful number, since it uses less digits than its factorization.

79778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468.

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

The square root of 79778 is about 282.4499955744. The cubic root of 79778 is about 43.0487998342.

The spelling of 79778 in words is "seventy-nine thousand, seven hundred seventy-eight".