656212842 has 48 divisors (see below), whose sum is σ = 1513512000. Its totient is φ = 204887232.

The previous prime is 656212829. The next prime is 656212849. The reversal of 656212842 is 248212656.

It is a happy number.

656212842 is a `hidden beast` number, since 6 + 5 + 621 + 28 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 656212797 and 656212806.

It is not an unprimeable number, because it can be changed into a prime (656212849) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19659 + ... + 41217.

It is an arithmetic number, because the mean of its divisors is an integer number (31531500).

Almost surely, 2^656212842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656212842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (756756000).

656212842 is an abundant number, since it is smaller than the sum of its proper divisors (857299158).

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

656212842 is a wasteful number, since it uses less digits than its factorization.

656212842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21675 (or 21672 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 656212842 is about 25616.6516547343. The cubic root of 656212842 is about 868.9902593631.

The spelling of 656212842 in words is "six hundred fifty-six million, two hundred twelve thousand, eight hundred forty-two".