709321540 has 48 divisors (see below), whose sum is σ = 1540514304. Its totient is φ = 274060800.

The previous prime is 709321537. The next prime is 709321573. The reversal of 709321540 is 45123907.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 605155 + ... + 606325.

It is an arithmetic number, because the mean of its divisors is an integer number (32094048).

Almost surely, 2^709321540 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 709321540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (770257152).

709321540 is an abundant number, since it is smaller than the sum of its proper divisors (831192764).

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

709321540 is a wasteful number, since it uses less digits than its factorization.

709321540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188 (or 2186 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 709321540 is about 26633.0910710717. The cubic root of 709321540 is about 891.8278891325.

The spelling of 709321540 in words is "seven hundred nine million, three hundred twenty-one thousand, five hundred forty".