77964479 has 2 divisors, whose sum is σ = 77964480. Its totient is φ = 77964478.

The previous prime is 77964443. The next prime is 77964487. The reversal of 77964479 is 97446977.

It is a strong prime.

It is an emirp because it is prime and its reverse (97446977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77964479 - 2¹² = 77960383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77964479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77964409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38982239 + 38982240.

It is an arithmetic number, because the mean of its divisors is an integer number (38982240).

Almost surely, 2^77964479 is an apocalyptic number.

77964479 is a deficient number, since it is larger than the sum of its proper divisors (1).

77964479 is an equidigital number, since it uses as much as digits as its factorization.

77964479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2667168, while the sum is 53.

The square root of 77964479 is about 8829.7496567004. The cubic root of 77964479 is about 427.2009997282.

The spelling of 77964479 in words is "seventy-seven million, nine hundred sixty-four thousand, four hundred seventy-nine".