70839887 has 2 divisors, whose sum is σ = 70839888. Its totient is φ = 70839886.

The previous prime is 70839883. The next prime is 70839889. The reversal of 70839887 is 78893807.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70839887 - 2² = 70839883 is a prime.

Together with 70839889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70839883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35419943 + 35419944.

It is an arithmetic number, because the mean of its divisors is an integer number (35419944).

Almost surely, 2^70839887 is an apocalyptic number.

70839887 is a deficient number, since it is larger than the sum of its proper divisors (1).

70839887 is an equidigital number, since it uses as much as digits as its factorization.

70839887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 70839887 is about 8416.6434521132. The cubic root of 70839887 is about 413.7702736481.

The spelling of 70839887 in words is "seventy million, eight hundred thirty-nine thousand, eight hundred eighty-seven".