78681479 has 2 divisors, whose sum is σ = 78681480. Its totient is φ = 78681478.

The previous prime is 78681467. The next prime is 78681509. The reversal of 78681479 is 97418687.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78681479 - 2²⁰ = 77632903 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 (78681409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39340739 + 39340740.

It is an arithmetic number, because the mean of its divisors is an integer number (39340740).

Almost surely, 2^78681479 is an apocalyptic number.

78681479 is a deficient number, since it is larger than the sum of its proper divisors (1).

78681479 is an equidigital number, since it uses as much as digits as its factorization.

78681479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 50.

The square root of 78681479 is about 8870.2581134937. The cubic root of 78681479 is about 428.5065896460.

The spelling of 78681479 in words is "seventy-eight million, six hundred eighty-one thousand, four hundred seventy-nine".