656115240 has 192 divisors, whose sum is σ = 2196734400. Its totient is φ = 156625920.

The previous prime is 656115211. The next prime is 656115247. The reversal of 656115240 is 42511656.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 656115198 and 656115207.

It is not an unprimeable number, because it can be changed into a prime (656115247) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 1059651 + ... + 1060269.

It is an arithmetic number, because the mean of its divisors is an integer number (11441325).

Almost surely, 2^656115240 is an apocalyptic number.

656115240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656115240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1098367200).

656115240 is an abundant number, since it is smaller than the sum of its proper divisors (1540619160).

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

656115240 is a wasteful number, since it uses less digits than its factorization.

656115240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 656115240 is about 25614.7465339792. The cubic root of 656115240 is about 868.9471740574.

Adding to 656115240 its reverse (42511656), we get a palindrome (698626896).

The spelling of 656115240 in words is "six hundred fifty-six million, one hundred fifteen thousand, two hundred forty".