78735479 has 2 divisors, whose sum is σ = 78735480. Its totient is φ = 78735478.

The previous prime is 78735473. The next prime is 78735491. The reversal of 78735479 is 97453787.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78735479 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78735473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39367739 + 39367740.

It is an arithmetic number, because the mean of its divisors is an integer number (39367740).

Almost surely, 2^78735479 is an apocalyptic number.

78735479 is a deficient number, since it is larger than the sum of its proper divisors (1).

78735479 is an equidigital number, since it uses as much as digits as its factorization.

78735479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1481760, while the sum is 50.

The square root of 78735479 is about 8873.3014712676. The cubic root of 78735479 is about 428.6045968880.

The spelling of 78735479 in words is "seventy-eight million, seven hundred thirty-five thousand, four hundred seventy-nine".