656286740 has 48 divisors (see below), whose sum is σ = 1428102144. Its totient is φ = 253075200.

The previous prime is 656286731. The next prime is 656286779. The reversal of 656286740 is 47682656.

It is a junction number, because it is equal to n+sod(n) for n = 656286691 and 656286700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172337 + ... + 176103.

It is an arithmetic number, because the mean of its divisors is an integer number (29752128).

Almost surely, 2^656286740 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 656286740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (714051072).

656286740 is an abundant number, since it is smaller than the sum of its proper divisors (771815404).

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

656286740 is a wasteful number, since it uses less digits than its factorization.

656286740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4088 (or 4086 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 656286740 is about 25618.0939962363. The cubic root of 656286740 is about 869.0228779627.

The spelling of 656286740 in words is "six hundred fifty-six million, two hundred eighty-six thousand, seven hundred forty".