70978993 has 2 divisors, whose sum is σ = 70978994. Its totient is φ = 70978992.

The previous prime is 70978991. The next prime is 70978997. The reversal of 70978993 is 39987907.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68939809 + 2039184 = 8303^2 + 1428^2 .

It is an emirp because it is prime and its reverse (39987907) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70978993 - 2¹ = 70978991 is a prime.

Together with 70978991, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 70978993.

It is not a weakly prime, because it can be changed into another prime (70978991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35489496 + 35489497.

It is an arithmetic number, because the mean of its divisors is an integer number (35489497).

Almost surely, 2^70978993 is an apocalyptic number.

It is an amenable number.

70978993 is a deficient number, since it is larger than the sum of its proper divisors (1).

70978993 is an equidigital number, since it uses as much as digits as its factorization.

70978993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 857304, while the sum is 52.

The square root of 70978993 is about 8424.9031448439. The cubic root of 70978993 is about 414.0409323419.

The spelling of 70978993 in words is "seventy million, nine hundred seventy-eight thousand, nine hundred ninety-three".