78758261 has 2 divisors, whose sum is σ = 78758262. Its totient is φ = 78758260.

The previous prime is 78758227. The next prime is 78758269. The reversal of 78758261 is 16285787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62315236 + 16443025 = 7894^2 + 4055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78758261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78758269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39379130 + 39379131.

It is an arithmetic number, because the mean of its divisors is an integer number (39379131).

Almost surely, 2^78758261 is an apocalyptic number.

It is an amenable number.

78758261 is a deficient number, since it is larger than the sum of its proper divisors (1).

78758261 is an equidigital number, since it uses as much as digits as its factorization.

78758261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 44.

The square root of 78758261 is about 8874.5851170632. The cubic root of 78758261 is about 428.6459316137.

The spelling of 78758261 in words is "seventy-eight million, seven hundred fifty-eight thousand, two hundred sixty-one".