55647228 has 96 divisors (see below), whose sum is σ = 161441280. Its totient is φ = 14526720.

The previous prime is 55647211. The next prime is 55647233. The reversal of 55647228 is 82274655.

It is a super-2 number, since 2×55647228² = 6193227968167968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142858 + ... + 143246.

It is an arithmetic number, because the mean of its divisors is an integer number (1681680).

Almost surely, 2^55647228 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 55647228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80720640).

55647228 is an abundant number, since it is smaller than the sum of its proper divisors (105794052).

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

55647228 is a wasteful number, since it uses less digits than its factorization.

55647228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547 (or 545 counting only the distinct ones).

The product of its digits is 134400, while the sum is 39.

The square root of 55647228 is about 7459.7069647540. The cubic root of 55647228 is about 381.7811763559.

The spelling of 55647228 in words is "fifty-five million, six hundred forty-seven thousand, two hundred twenty-eight".