78634903 has 2 divisors, whose sum is σ = 78634904. Its totient is φ = 78634902.

The previous prime is 78634883. The next prime is 78634931. The reversal of 78634903 is 30943687.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78634903 - 2²¹ = 76537751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78634973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39317451 + 39317452.

It is an arithmetic number, because the mean of its divisors is an integer number (39317452).

Almost surely, 2^78634903 is an apocalyptic number.

78634903 is a deficient number, since it is larger than the sum of its proper divisors (1).

78634903 is an equidigital number, since it uses as much as digits as its factorization.

78634903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 78634903 is about 8867.6323221027. The cubic root of 78634903 is about 428.4220205598.

The spelling of 78634903 in words is "seventy-eight million, six hundred thirty-four thousand, nine hundred three".