78769 has 4 divisors (see below), whose sum is σ = 79344. Its totient is φ = 78196.

The previous prime is 78737. The next prime is 78779. The reversal of 78769 is 96787.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 78769 - 2⁵ = 78737 is a prime.

It is a super-2 number, since 2×78769² = 12409110722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78779) 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, 54 + ... + 400.

It is an arithmetic number, because the mean of its divisors is an integer number (19836).

2⁷⁸⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

78769 is a deficient number, since it is larger than the sum of its proper divisors (575).

78769 is a wasteful number, since it uses less digits than its factorization.

78769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574.

The product of its digits is 21168, while the sum is 37.

The square root of 78769 is about 280.6581550570. The cubic root of 78769 is about 42.8665413250.

The spelling of 78769 in words is "seventy-eight thousand, seven hundred sixty-nine".