70889989 has 2 divisors, whose sum is σ = 70889990. Its totient is φ = 70889988.

The previous prime is 70889971. The next prime is 70889993. The reversal of 70889989 is 98998807.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70845889 + 44100 = 8417^2 + 210^2 .

It is a cyclic number.

It is not a de Polignac number, because 70889989 - 2⁹ = 70889477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70889999) 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, 35444994 + 35444995.

It is an arithmetic number, because the mean of its divisors is an integer number (35444995).

Almost surely, 2^70889989 is an apocalyptic number.

It is an amenable number.

70889989 is a deficient number, since it is larger than the sum of its proper divisors (1).

70889989 is an equidigital number, since it uses as much as digits as its factorization.

70889989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 58.

The square root of 70889989 is about 8419.6192906805. The cubic root of 70889989 is about 413.8677979560.

The spelling of 70889989 in words is "seventy million, eight hundred eighty-nine thousand, nine hundred eighty-nine".