705478644 has 144 divisors (see below), whose sum is σ = 1975209600. Its totient is φ = 210988800.

The previous prime is 705478591. The next prime is 705478651. The reversal of 705478644 is 446874507.

It is a self number, because there is not a number n which added to its sum of digits gives 705478644.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4671969 + ... + 4672119.

Almost surely, 2^705478644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 705478644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (987604800).

705478644 is an abundant number, since it is smaller than the sum of its proper divisors (1269730956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

705478644 is a wasteful number, since it uses less digits than its factorization.

705478644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 45.

The square root of 705478644 is about 26560.8479533316. The cubic root of 705478644 is about 890.2144178920.

The spelling of 705478644 in words is "seven hundred five million, four hundred seventy-eight thousand, six hundred forty-four".