656423028 has 60 divisors (see below), whose sum is σ = 1722323680. Its totient is φ = 218004048.

The previous prime is 656423011. The next prime is 656423029. The reversal of 656423028 is 820324656.

656423028 is a `hidden beast` number, since 6 + 5 + 642 + 3 + 0 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 656422983 and 656423001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656423029) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 88113 + ... + 95271.

Almost surely, 2^656423028 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 656423028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (861161840).

656423028 is an abundant number, since it is smaller than the sum of its proper divisors (1065900652).

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

656423028 is a wasteful number, since it uses less digits than its factorization.

656423028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7458 (or 7447 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 656423028 is about 25620.7538530778. The cubic root of 656423028 is about 869.0830291056.

It can be divided in two parts, 6564 and 23028, that added together give a palindrome (29592).

The spelling of 656423028 in words is "six hundred fifty-six million, four hundred twenty-three thousand, twenty-eight".