785706640 has 20 divisors (see below), whose sum is σ = 1826768124. Its totient is φ = 314282624.

The previous prime is 785706631. The next prime is 785706641. The reversal of 785706640 is 46607587.

It can be written as a sum of positive squares in 2 ways, for example, as 524043664 + 261662976 = 22892^2 + 16176^2 .

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

It is not an unprimeable number, because it can be changed into a prime (785706641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4910587 + ... + 4910746.

Almost surely, 2^785706640 is an apocalyptic number.

It is an amenable number.

785706640 is an abundant number, since it is smaller than the sum of its proper divisors (1041061484).

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

785706640 is a wasteful number, since it uses less digits than its factorization.

785706640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9821346 (or 9821340 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 785706640 is about 28030.4591471492. The cubic root of 785706640 is about 922.7558513125.

The spelling of 785706640 in words is "seven hundred eighty-five million, seven hundred six thousand, six hundred forty".