709784640 has 224 divisors, whose sum is σ = 2529596160. Its totient is φ = 187342848.

The previous prime is 709784633. The next prime is 709784651. The reversal of 709784640 is 46487907.

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, 975957 + ... + 976683.

It is an arithmetic number, because the mean of its divisors is an integer number (11292840).

Almost surely, 2^709784640 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 709784640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1264798080).

709784640 is an abundant number, since it is smaller than the sum of its proper divisors (1819811520).

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

709784640 is a wasteful number, since it uses less digits than its factorization.

709784640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 850 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 709784640 is about 26641.7837240677. The cubic root of 709784640 is about 892.0219316666.

The spelling of 709784640 in words is "seven hundred nine million, seven hundred eighty-four thousand, six hundred forty".