55217828 has 12 divisors (see below), whose sum is σ = 96974640. Its totient is φ = 27510792.

The previous prime is 55217821. The next prime is 55217837. The reversal of 55217828 is 82871255.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 55217791 and 55217800.

It is not an unprimeable number, because it can be changed into a prime (55217821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23258 + ... + 25521.

It is an arithmetic number, because the mean of its divisors is an integer number (8081220).

Almost surely, 2^55217828 is an apocalyptic number.

It is an amenable number.

55217828 is a deficient number, since it is larger than the sum of its proper divisors (41756812).

55217828 is a wasteful number, since it uses less digits than its factorization.

55217828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49066 (or 49064 counting only the distinct ones).

The product of its digits is 44800, while the sum is 38.

The square root of 55217828 is about 7430.8699356132. The cubic root of 55217828 is about 380.7966389936.

The spelling of 55217828 in words is "fifty-five million, two hundred seventeen thousand, eight hundred twenty-eight".