97779 has 8 divisors (see below), whose sum is σ = 142272. Its totient is φ = 59240.

The previous prime is 97777. The next prime is 97787.

97779 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 97779 - 2¹ = 97777 is a prime.

97779 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (97771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1449 + ... + 1514.

It is an arithmetic number, because the mean of its divisors is an integer number (17784).

2⁹⁷⁷⁷⁹ is an apocalyptic number.

97779 is a deficient number, since it is larger than the sum of its proper divisors (44493).

97779 is a wasteful number, since it uses less digits than its factorization.

97779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2977.

The product of its digits is 27783, while the sum is 39.

The square root of 97779 is about 312.6963383220. The cubic root of 97779 is about 46.0696801555.

Subtracting from 97779 its product of digits (27783), we obtain a palindrome (69996).

The spelling of 97779 in words is "ninety-seven thousand, seven hundred seventy-nine".