61646228 has 72 divisors (see below), whose sum is σ = 133459200. Its totient is φ = 24373440.

The previous prime is 61646201. The next prime is 61646239. The reversal of 61646228 is 82264616.

61646228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 780293 + ... + 780371.

It is an arithmetic number, because the mean of its divisors is an integer number (1853600).

Almost surely, 2^61646228 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 61646228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66729600).

61646228 is an abundant number, since it is smaller than the sum of its proper divisors (71812972).

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

61646228 is a wasteful number, since it uses less digits than its factorization.

61646228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181 (or 148 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 61646228 is about 7851.5111921209. The cubic root of 61646228 is about 395.0349336193.

The spelling of 61646228 in words is "sixty-one million, six hundred forty-six thousand, two hundred twenty-eight".