83778479 has 2 divisors, whose sum is σ = 83778480. Its totient is φ = 83778478.

The previous prime is 83778439. The next prime is 83778493. The reversal of 83778479 is 97487738.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 83778479 - 2²⁰ = 82729903 is a prime.

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 83778479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83778439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41889239 + 41889240.

It is an arithmetic number, because the mean of its divisors is an integer number (41889240).

Almost surely, 2^83778479 is an apocalyptic number.

83778479 is a deficient number, since it is larger than the sum of its proper divisors (1).

83778479 is an equidigital number, since it uses as much as digits as its factorization.

83778479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 53.

The square root of 83778479 is about 9153.0584505945. The cubic root of 83778479 is about 437.5665927476.

The spelling of 83778479 in words is "eighty-three million, seven hundred seventy-eight thousand, four hundred seventy-nine".