70778893 has 2 divisors, whose sum is σ = 70778894. Its totient is φ = 70778892.

The previous prime is 70778861. The next prime is 70778899. The reversal of 70778893 is 39887707.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70778569 + 324 = 8413^2 + 18^2 .

It is a cyclic number.

It is not a de Polignac number, because 70778893 - 2⁵ = 70778861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70778899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35389446 + 35389447.

It is an arithmetic number, because the mean of its divisors is an integer number (35389447).

Almost surely, 2^70778893 is an apocalyptic number.

It is an amenable number.

70778893 is a deficient number, since it is larger than the sum of its proper divisors (1).

70778893 is an equidigital number, since it uses as much as digits as its factorization.

70778893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 592704, while the sum is 49.

The square root of 70778893 is about 8413.0192558914. The cubic root of 70778893 is about 413.6514858113.

The spelling of 70778893 in words is "seventy million, seven hundred seventy-eight thousand, eight hundred ninety-three".