656425140 has 192 divisors, whose sum is σ = 2200794624. Its totient is φ = 143050752.

The previous prime is 656425127. The next prime is 656425157. The reversal of 656425140 is 41524656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 823222 + ... + 824018.

It is an arithmetic number, because the mean of its divisors is an integer number (11462472).

Almost surely, 2^656425140 is an apocalyptic number.

656425140 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 656425140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1100397312).

656425140 is an abundant number, since it is smaller than the sum of its proper divisors (1544369484).

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

656425140 is a wasteful number, since it uses less digits than its factorization.

656425140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906 (or 904 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 656425140 is about 25620.7950696305. The cubic root of 656425140 is about 869.0839611780.

Adding to 656425140 its reverse (41524656), we get a palindrome (697949796).

The spelling of 656425140 in words is "six hundred fifty-six million, four hundred twenty-five thousand, one hundred forty".