77379479 has 2 divisors, whose sum is σ = 77379480. Its totient is φ = 77379478.

The previous prime is 77379451. The next prime is 77379481. The reversal of 77379479 is 97497377.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (97497377) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77379479 - 2¹² = 77375383 is a prime.

It is a super-2 number, since 2×77379479² = 11975167540622882, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 77379481, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77379479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77379409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38689739 + 38689740.

It is an arithmetic number, because the mean of its divisors is an integer number (38689740).

Almost surely, 2^77379479 is an apocalyptic number.

77379479 is a deficient number, since it is larger than the sum of its proper divisors (1).

77379479 is an equidigital number, since it uses as much as digits as its factorization.

77379479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2333772, while the sum is 53.

The square root of 77379479 is about 8796.5606347026. The cubic root of 77379479 is about 426.1298270057.

The spelling of 77379479 in words is "seventy-seven million, three hundred seventy-nine thousand, four hundred seventy-nine".