78910849 has 2 divisors, whose sum is σ = 78910850. Its totient is φ = 78910848.

The previous prime is 78910831. The next prime is 78910873. The reversal of 78910849 is 94801987.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78588225 + 322624 = 8865^2 + 568^2 .

It is a cyclic number.

It is not a de Polignac number, because 78910849 - 2⁵ = 78910817 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78910799 and 78910808.

It is not a weakly prime, because it can be changed into another prime (78910829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39455424 + 39455425.

It is an arithmetic number, because the mean of its divisors is an integer number (39455425).

Almost surely, 2^78910849 is an apocalyptic number.

It is an amenable number.

78910849 is a deficient number, since it is larger than the sum of its proper divisors (1).

78910849 is an equidigital number, since it uses as much as digits as its factorization.

78910849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 78910849 is about 8883.1778660567. The cubic root of 78910849 is about 428.9225757404.

The spelling of 78910849 in words is "seventy-eight million, nine hundred ten thousand, eight hundred forty-nine".