78873979 has 2 divisors, whose sum is σ = 78873980. Its totient is φ = 78873978.

The previous prime is 78873953. The next prime is 78874007. The reversal of 78873979 is 97937887.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78873979 - 2⁵ = 78873947 is a prime.

It is a super-2 number, since 2×78873979² = 12442209126584882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78873919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39436989 + 39436990.

It is an arithmetic number, because the mean of its divisors is an integer number (39436990).

Almost surely, 2^78873979 is an apocalyptic number.

78873979 is a deficient number, since it is larger than the sum of its proper divisors (1).

78873979 is an equidigital number, since it uses as much as digits as its factorization.

78873979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5334336, while the sum is 58.

The square root of 78873979 is about 8881.1023527488. The cubic root of 78873979 is about 428.8557626248.

The spelling of 78873979 in words is "seventy-eight million, eight hundred seventy-three thousand, nine hundred seventy-nine".