78367879 has 2 divisors, whose sum is σ = 78367880. Its totient is φ = 78367878.

The previous prime is 78367787. The next prime is 78367937. The reversal of 78367879 is 97876387.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78367879 is a prime.

It is a super-2 number, since 2×78367879² = 12283048917917282, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78367379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39183939 + 39183940.

It is an arithmetic number, because the mean of its divisors is an integer number (39183940).

Almost surely, 2^78367879 is an apocalyptic number.

78367879 is a deficient number, since it is larger than the sum of its proper divisors (1).

78367879 is an equidigital number, since it uses as much as digits as its factorization.

78367879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 55.

The square root of 78367879 is about 8852.5634140626. The cubic root of 78367879 is about 427.9365334460.

The spelling of 78367879 in words is "seventy-eight million, three hundred sixty-seven thousand, eight hundred seventy-nine".