705649989 has 16 divisors (see below), whose sum is σ = 1030893120. Its totient is φ = 425794560.

The previous prime is 705649969. The next prime is 705649999. The reversal of 705649989 is 989946507.

705649989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 705649989 - 2²⁴ = 688872773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705649969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39132 + ... + 54245.

It is an arithmetic number, because the mean of its divisors is an integer number (64430820).

Almost surely, 2^705649989 is an apocalyptic number.

It is an amenable number.

705649989 is a deficient number, since it is larger than the sum of its proper divisors (325243131).

705649989 is a wasteful number, since it uses less digits than its factorization.

705649989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93620.

The product of its (nonzero) digits is 4898880, while the sum is 57.

The square root of 705649989 is about 26564.0732757610. The cubic root of 705649989 is about 890.2864831220.

The spelling of 705649989 in words is "seven hundred five million, six hundred forty-nine thousand, nine hundred eighty-nine".