70285781 has 2 divisors, whose sum is σ = 70285782. Its totient is φ = 70285780.

The previous prime is 70285771. The next prime is 70285793. The reversal of 70285781 is 18758207.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54612100 + 15673681 = 7390^2 + 3959^2 .

It is a cyclic number.

It is not a de Polignac number, because 70285781 - 2⁶ = 70285717 is a prime.

It is a super-2 number, since 2×70285781² = 9880182021559922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70285751) 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, 35142890 + 35142891.

It is an arithmetic number, because the mean of its divisors is an integer number (35142891).

Almost surely, 2^70285781 is an apocalyptic number.

It is an amenable number.

70285781 is a deficient number, since it is larger than the sum of its proper divisors (1).

70285781 is an equidigital number, since it uses as much as digits as its factorization.

70285781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 70285781 is about 8383.6615508977. The cubic root of 70285781 is about 412.6886184842.

The spelling of 70285781 in words is "seventy million, two hundred eighty-five thousand, seven hundred eighty-one".