55581224 has 8 divisors (see below), whose sum is σ = 104214810. Its totient is φ = 27790608.

The previous prime is 55581223. The next prime is 55581263. The reversal of 55581224 is 42218555.

It can be written as a sum of positive squares in only one way, i.e., 49420900 + 6160324 = 7030^2 + 2482^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×55581224² = 6178544922676352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55581223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3473819 + ... + 3473834.

Almost surely, 2^55581224 is an apocalyptic number.

It is an amenable number.

55581224 is a deficient number, since it is larger than the sum of its proper divisors (48633586).

55581224 is a wasteful number, since it uses less digits than its factorization.

55581224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6947659 (or 6947655 counting only the distinct ones).

The product of its digits is 16000, while the sum is 32.

The square root of 55581224 is about 7455.2816177526. The cubic root of 55581224 is about 381.6301712040.

Adding to 55581224 its reverse (42218555), we get a palindrome (97799779).

The spelling of 55581224 in words is "fifty-five million, five hundred eighty-one thousand, two hundred twenty-four".