656512340 has 48 divisors (see below), whose sum is σ = 1512411264. Its totient is φ = 237398400.

The previous prime is 656512333. The next prime is 656512361. The reversal of 656512340 is 43215656.

It is a junction number, because it is equal to n+sod(n) for n = 656512297 and 656512306.

It is a congruent number.

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, 31577 + ... + 48063.

It is an arithmetic number, because the mean of its divisors is an integer number (31508568).

Almost surely, 2^656512340 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 656512340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (756205632).

656512340 is an abundant number, since it is smaller than the sum of its proper divisors (855898924).

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

656512340 is a wasteful number, since it uses less digits than its factorization.

656512340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16688 (or 16686 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 656512340 is about 25622.4967557808. The cubic root of 656512340 is about 869.1224427257.

Adding to 656512340 its reverse (43215656), we get a palindrome (699727996).

The spelling of 656512340 in words is "six hundred fifty-six million, five hundred twelve thousand, three hundred forty".