77958479 has 2 divisors, whose sum is σ = 77958480. Its totient is φ = 77958478.

The previous prime is 77958457. The next prime is 77958509. The reversal of 77958479 is 97485977.

It is a weak prime.

It is an emirp because it is prime and its reverse (97485977) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77958479 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77958079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38979239 + 38979240.

It is an arithmetic number, because the mean of its divisors is an integer number (38979240).

Almost surely, 2^77958479 is an apocalyptic number.

77958479 is a deficient number, since it is larger than the sum of its proper divisors (1).

77958479 is an equidigital number, since it uses as much as digits as its factorization.

77958479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4445280, while the sum is 56.

The square root of 77958479 is about 8829.4098896812. The cubic root of 77958479 is about 427.1900405847.

The spelling of 77958479 in words is "seventy-seven million, nine hundred fifty-eight thousand, four hundred seventy-nine".