709568640 has 256 divisors, whose sum is σ = 2742249600. Its totient is φ = 171970560.

The previous prime is 709568617. The next prime is 709568663. The reversal of 709568640 is 46865907.

It is an interprime number because it is at equal distance from previous prime (709568617) and next prime (709568663).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188214 + ... + 191946.

Almost surely, 2^709568640 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 709568640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1371124800).

709568640 is an abundant number, since it is smaller than the sum of its proper divisors (2032680960).

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

709568640 is a wasteful number, since it uses less digits than its factorization.

709568640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3772 (or 3754 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 709568640 is about 26637.7296329849. The cubic root of 709568640 is about 891.9314364776.

The spelling of 709568640 in words is "seven hundred nine million, five hundred sixty-eight thousand, six hundred forty".