70643999 has 2 divisors, whose sum is σ = 70644000. Its totient is φ = 70643998.

The previous prime is 70643927. The next prime is 70644019. The reversal of 70643999 is 99934607.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 70643999 - 2¹⁶ = 70578463 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 (70643299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35321999 + 35322000.

It is an arithmetic number, because the mean of its divisors is an integer number (35322000).

Almost surely, 2^70643999 is an apocalyptic number.

70643999 is a deficient number, since it is larger than the sum of its proper divisors (1).

70643999 is an equidigital number, since it uses as much as digits as its factorization.

70643999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 47.

The square root of 70643999 is about 8404.9984533015. The cubic root of 70643999 is about 413.3885327049.

The spelling of 70643999 in words is "seventy million, six hundred forty-three thousand, nine hundred ninety-nine".