70878817 has 2 divisors, whose sum is σ = 70878818. Its totient is φ = 70878816.

The previous prime is 70878781. The next prime is 70878859. The reversal of 70878817 is 71887807.

Together with previous prime (70878781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41977441 + 28901376 = 6479^2 + 5376^2 .

It is an emirp because it is prime and its reverse (71887807) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70878817 is a prime.

It is not a weakly prime, because it can be changed into another prime (70878877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35439408 + 35439409.

It is an arithmetic number, because the mean of its divisors is an integer number (35439409).

Almost surely, 2^70878817 is an apocalyptic number.

It is an amenable number.

70878817 is a deficient number, since it is larger than the sum of its proper divisors (1).

70878817 is an equidigital number, since it uses as much as digits as its factorization.

70878817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 175616, while the sum is 46.

The square root of 70878817 is about 8418.9558141138. The cubic root of 70878817 is about 413.8460554692.

The spelling of 70878817 in words is "seventy million, eight hundred seventy-eight thousand, eight hundred seventeen".