78864827 has 2 divisors, whose sum is σ = 78864828. Its totient is φ = 78864826.

The previous prime is 78864823. The next prime is 78864859. The reversal of 78864827 is 72846887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78864827 - 2² = 78864823 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78864823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39432413 + 39432414.

It is an arithmetic number, because the mean of its divisors is an integer number (39432414).

Almost surely, 2^78864827 is an apocalyptic number.

78864827 is a deficient number, since it is larger than the sum of its proper divisors (1).

78864827 is an equidigital number, since it uses as much as digits as its factorization.

78864827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1204224, while the sum is 50.

The square root of 78864827 is about 8880.5870864487. The cubic root of 78864827 is about 428.8391748147.

The spelling of 78864827 in words is "seventy-eight million, eight hundred sixty-four thousand, eight hundred twenty-seven".