78863507 has 2 divisors, whose sum is σ = 78863508. Its totient is φ = 78863506.

The previous prime is 78863497. The next prime is 78863513. The reversal of 78863507 is 70536887.

It is a strong prime.

It is an emirp because it is prime and its reverse (70536887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78863507 - 2²⁰ = 77814931 is a prime.

It is not a weakly prime, because it can be changed into another prime (78863107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39431753 + 39431754.

It is an arithmetic number, because the mean of its divisors is an integer number (39431754).

Almost surely, 2^78863507 is an apocalyptic number.

78863507 is a deficient number, since it is larger than the sum of its proper divisors (1).

78863507 is an equidigital number, since it uses as much as digits as its factorization.

78863507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 78863507 is about 8880.5127667269. The cubic root of 78863507 is about 428.8367822362.

The spelling of 78863507 in words is "seventy-eight million, eight hundred sixty-three thousand, five hundred seven".