70778563 has 2 divisors, whose sum is σ = 70778564. Its totient is φ = 70778562.

The previous prime is 70778557. The next prime is 70778621. The reversal of 70778563 is 36587707.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70778563 is a prime.

It is not a weakly prime, because it can be changed into another prime (70778963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35389281 + 35389282.

It is an arithmetic number, because the mean of its divisors is an integer number (35389282).

Almost surely, 2^70778563 is an apocalyptic number.

70778563 is a deficient number, since it is larger than the sum of its proper divisors (1).

70778563 is an equidigital number, since it uses as much as digits as its factorization.

70778563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 246960, while the sum is 43.

The square root of 70778563 is about 8412.9996434090. Note that the first 3 decimals coincide. The cubic root of 70778563 is about 413.6508429398.

The spelling of 70778563 in words is "seventy million, seven hundred seventy-eight thousand, five hundred sixty-three".