78860291 has 2 divisors, whose sum is σ = 78860292. Its totient is φ = 78860290.

The previous prime is 78860267. The next prime is 78860329. The reversal of 78860291 is 19206887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78860291 - 2⁶ = 78860227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78860191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39430145 + 39430146.

It is an arithmetic number, because the mean of its divisors is an integer number (39430146).

Almost surely, 2^78860291 is an apocalyptic number.

78860291 is a deficient number, since it is larger than the sum of its proper divisors (1).

78860291 is an equidigital number, since it uses as much as digits as its factorization.

78860291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 78860291 is about 8880.3316942556. The cubic root of 78860291 is about 428.8309529332.

The spelling of 78860291 in words is "seventy-eight million, eight hundred sixty thousand, two hundred ninety-one".