55776224 has 36 divisors (see below), whose sum is σ = 125748504. Its totient is φ = 23856192.

The previous prime is 55776199. The next prime is 55776247. The reversal of 55776224 is 42267755.

It is a happy number.

It is a super-2 number, since 2×55776224² = 6221974327396352, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111527 + ... + 112025.

It is an arithmetic number, because the mean of its divisors is an integer number (3493014).

Almost surely, 2^55776224 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 55776224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62874252).

55776224 is an abundant number, since it is smaller than the sum of its proper divisors (69972280).

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

55776224 is an frugal number, since it uses more digits than its factorization.

55776224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015 (or 508 counting only the distinct ones).

The product of its digits is 117600, while the sum is 38.

The square root of 55776224 is about 7468.3481440008. The cubic root of 55776224 is about 382.0759513828.

The spelling of 55776224 in words is "fifty-five million, seven hundred seventy-six thousand, two hundred twenty-four".