78550873 has 2 divisors, whose sum is σ = 78550874. Its totient is φ = 78550872.

The previous prime is 78550861. The next prime is 78550903. The reversal of 78550873 is 37805587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66634569 + 11916304 = 8163^2 + 3452^2 .

It is a cyclic number.

It is not a de Polignac number, because 78550873 - 2²¹ = 76453721 is a prime.

It is not a weakly prime, because it can be changed into another prime (78550273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39275436 + 39275437.

It is an arithmetic number, because the mean of its divisors is an integer number (39275437).

Almost surely, 2^78550873 is an apocalyptic number.

It is an amenable number.

78550873 is a deficient number, since it is larger than the sum of its proper divisors (1).

78550873 is an equidigital number, since it uses as much as digits as its factorization.

78550873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235200, while the sum is 43.

The square root of 78550873 is about 8862.8930378291. The cubic root of 78550873 is about 428.2693608966.

The spelling of 78550873 in words is "seventy-eight million, five hundred fifty thousand, eight hundred seventy-three".