70778791 has 2 divisors, whose sum is σ = 70778792. Its totient is φ = 70778790.

The previous prime is 70778779. The next prime is 70778801. The reversal of 70778791 is 19787707.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70778791 - 2⁵ = 70778759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70778711) 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, 35389395 + 35389396.

It is an arithmetic number, because the mean of its divisors is an integer number (35389396).

Almost surely, 2^70778791 is an apocalyptic number.

70778791 is a deficient number, since it is larger than the sum of its proper divisors (1).

70778791 is an equidigital number, since it uses as much as digits as its factorization.

70778791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172872, while the sum is 46.

The square root of 70778791 is about 8413.0131938563. The cubic root of 70778791 is about 413.6512871058.

The spelling of 70778791 in words is "seventy million, seven hundred seventy-eight thousand, seven hundred ninety-one".