709888640 has 64 divisors (see below), whose sum is σ = 1786428000. Its totient is φ = 269005824.

The previous prime is 709888633. The next prime is 709888643. The reversal of 709888640 is 46888907.

It is a tau number, because it is divible by the number of its divisors (64).

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (709888643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17030 + ... + 41349.

Almost surely, 2^709888640 is an apocalyptic number.

It is an amenable number.

709888640 is an abundant number, since it is smaller than the sum of its proper divisors (1076539360).

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

709888640 is a wasteful number, since it uses less digits than its factorization.

709888640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58417 (or 58405 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 50.

The square root of 709888640 is about 26643.7354738408. The cubic root of 709888640 is about 892.0654968764.

The spelling of 709888640 in words is "seven hundred nine million, eight hundred eighty-eight thousand, six hundred forty".