78749 has 4 divisors (see below), whose sum is σ = 85920. Its totient is φ = 71580.

The previous prime is 78737. The next prime is 78779. The reversal of 78749 is 94787.

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.

It is a cyclic number.

It is not a de Polignac number, because 78749 - 2¹² = 74653 is a prime.

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

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent 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, 3569 + ... + 3590.

It is an arithmetic number, because the mean of its divisors is an integer number (21480).

2⁷⁸⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

78749 is a deficient number, since it is larger than the sum of its proper divisors (7171).

78749 is a wasteful number, since it uses less digits than its factorization.

78749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7170.

The product of its digits is 14112, while the sum is 35.

The square root of 78749 is about 280.6225222608. The cubic root of 78749 is about 42.8629129797.

The spelling of 78749 in words is "seventy-eight thousand, seven hundred forty-nine".