78097 has 4 divisors (see below), whose sum is σ = 80820. Its totient is φ = 75376.

The previous prime is 78079. The next prime is 78101. The reversal of 78097 is 79087.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36481 + 41616 = 191^2 + 204^2 .

It is a cyclic number.

It is not a de Polignac number, because 78097 - 2⁷ = 77969 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78007) 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, 1318 + ... + 1375.

It is an arithmetic number, because the mean of its divisors is an integer number (20205).

2⁷⁸⁰⁹⁷ is an apocalyptic number.

It is an amenable number.

78097 is a deficient number, since it is larger than the sum of its proper divisors (2723).

78097 is a wasteful number, since it uses less digits than its factorization.

78097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 78097 is about 279.4584047761. The cubic root of 78097 is about 42.7442909285.

Subtracting 78097 from its reverse (79087), we obtain a triangular number (990 = T₄₄).

The spelling of 78097 in words is "seventy-eight thousand, ninety-seven".