55309224 has 32 divisors (see below), whose sum is σ = 141217920. Its totient is φ = 18043776.

The previous prime is 55309217. The next prime is 55309277. The reversal of 55309224 is 42290355.

It is a super-2 number, since 2×55309224² = 6118220518964352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55309191 and 55309200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23389 + ... + 25644.

It is an arithmetic number, because the mean of its divisors is an integer number (4413060).

Almost surely, 2^55309224 is an apocalyptic number.

It is an amenable number.

55309224 is an abundant number, since it is smaller than the sum of its proper divisors (85908696).

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

55309224 is a wasteful number, since it uses less digits than its factorization.

55309224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49089 (or 49085 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 55309224 is about 7437.0171439899. The cubic root of 55309224 is about 381.0066201204.

Adding to 55309224 its reverse (42290355), we get a palindrome (97599579).

The spelling of 55309224 in words is "fifty-five million, three hundred nine thousand, two hundred twenty-four".