70657889 has 2 divisors, whose sum is σ = 70657890. Its totient is φ = 70657888.

The previous prime is 70657877. The next prime is 70657913. The reversal of 70657889 is 98875607.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47541025 + 23116864 = 6895^2 + 4808^2 .

It is an emirp because it is prime and its reverse (98875607) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70657889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (70657819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35328944 + 35328945.

It is an arithmetic number, because the mean of its divisors is an integer number (35328945).

Almost surely, 2^70657889 is an apocalyptic number.

It is an amenable number.

70657889 is a deficient number, since it is larger than the sum of its proper divisors (1).

70657889 is an equidigital number, since it uses as much as digits as its factorization.

70657889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 70657889 is about 8405.8247067138. The cubic root of 70657889 is about 413.4156243688.

The spelling of 70657889 in words is "seventy million, six hundred fifty-seven thousand, eight hundred eighty-nine".