78208979 has 2 divisors, whose sum is σ = 78208980. Its totient is φ = 78208978.

The previous prime is 78208951. The next prime is 78208981. The reversal of 78208979 is 97980287.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78208979 - 2⁸ = 78208723 is a prime.

It is a super-2 number, since 2×78208979² = 12233288792444882, which contains 22 as substring.

Together with 78208981, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (78208909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39104489 + 39104490.

It is an arithmetic number, because the mean of its divisors is an integer number (39104490).

Almost surely, 2^78208979 is an apocalyptic number.

78208979 is a deficient number, since it is larger than the sum of its proper divisors (1).

78208979 is an equidigital number, since it uses as much as digits as its factorization.

78208979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 78208979 is about 8843.5840585138. The cubic root of 78208979 is about 427.6471073589.

The spelling of 78208979 in words is "seventy-eight million, two hundred eight thousand, nine hundred seventy-nine".