705987440 has 20 divisors (see below), whose sum is σ = 1641420984. Its totient is φ = 282394944.

The previous prime is 705987439. The next prime is 705987473. The reversal of 705987440 is 44789507.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 705987391 and 705987400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4412342 + ... + 4412501.

Almost surely, 2^705987440 is an apocalyptic number.

It is an amenable number.

705987440 is an abundant number, since it is smaller than the sum of its proper divisors (935433544).

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

705987440 is a wasteful number, since it uses less digits than its factorization.

705987440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8824856 (or 8824850 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 705987440 is about 26570.4241592038. The cubic root of 705987440 is about 890.4283760301.

The spelling of 705987440 in words is "seven hundred five million, nine hundred eighty-seven thousand, four hundred forty".