78866771 has 2 divisors, whose sum is σ = 78866772. Its totient is φ = 78866770.

The previous prime is 78866737. The next prime is 78866803. The reversal of 78866771 is 17766887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78866771 - 2¹⁸ = 78604627 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78866731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39433385 + 39433386.

It is an arithmetic number, because the mean of its divisors is an integer number (39433386).

Almost surely, 2^78866771 is an apocalyptic number.

78866771 is a deficient number, since it is larger than the sum of its proper divisors (1).

78866771 is an equidigital number, since it uses as much as digits as its factorization.

78866771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 790272, while the sum is 50.

The square root of 78866771 is about 8880.6965379975. The cubic root of 78866771 is about 428.8426983817.

The spelling of 78866771 in words is "seventy-eight million, eight hundred sixty-six thousand, seven hundred seventy-one".