78049949 has 2 divisors, whose sum is σ = 78049950. Its totient is φ = 78049948.

The previous prime is 78049943. The next prime is 78049957. The reversal of 78049949 is 94994087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61387225 + 16662724 = 7835^2 + 4082^2 .

It is a cyclic number.

It is not a de Polignac number, because 78049949 - 2⁸ = 78049693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78049897 and 78049906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78049943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39024974 + 39024975.

It is an arithmetic number, because the mean of its divisors is an integer number (39024975).

Almost surely, 2^78049949 is an apocalyptic number.

It is an amenable number.

78049949 is a deficient number, since it is larger than the sum of its proper divisors (1).

78049949 is an equidigital number, since it uses as much as digits as its factorization.

78049949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 78049949 is about 8834.5882190400. The cubic root of 78049949 is about 427.3570517124.

The spelling of 78049949 in words is "seventy-eight million, forty-nine thousand, nine hundred forty-nine".