70278389 has 2 divisors, whose sum is σ = 70278390. Its totient is φ = 70278388.

The previous prime is 70278367. The next prime is 70278407. The reversal of 70278389 is 98387207.

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., 49420900 + 20857489 = 7030^2 + 4567^2 .

It is a cyclic number.

It is not a de Polignac number, because 70278389 - 2¹⁶ = 70212853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70278319) 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, 35139194 + 35139195.

It is an arithmetic number, because the mean of its divisors is an integer number (35139195).

Almost surely, 2^70278389 is an apocalyptic number.

It is an amenable number.

70278389 is a deficient number, since it is larger than the sum of its proper divisors (1).

70278389 is an equidigital number, since it uses as much as digits as its factorization.

70278389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 70278389 is about 8383.2206818144. The cubic root of 70278389 is about 412.6741504027.

The spelling of 70278389 in words is "seventy million, two hundred seventy-eight thousand, three hundred eighty-nine".