77479 has 2 divisors, whose sum is σ = 77480. Its totient is φ = 77478.

The previous prime is 77477. The next prime is 77489. The reversal of 77479 is 97477.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77479 - 2¹ = 77477 is a prime.

Together with 77477, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38739 + 38740.

It is an arithmetic number, because the mean of its divisors is an integer number (38740).

2⁷⁷⁴⁷⁹ is an apocalyptic number.

77479 is a deficient number, since it is larger than the sum of its proper divisors (1).

77479 is an equidigital number, since it uses as much as digits as its factorization.

77479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12348, while the sum is 34.

The square root of 77479 is about 278.3504984727. The cubic root of 77479 is about 42.6312436567.

The spelling of 77479 in words is "seventy-seven thousand, four hundred seventy-nine".