55684820 has 24 divisors (see below), whose sum is σ = 123093600. Its totient is φ = 21101472.

The previous prime is 55684819. The next prime is 55684829. The reversal of 55684820 is 2848655.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55684829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72890 + ... + 73649.

It is an arithmetic number, because the mean of its divisors is an integer number (5128900).

Almost surely, 2^55684820 is an apocalyptic number.

It is an amenable number.

55684820 is an abundant number, since it is smaller than the sum of its proper divisors (67408780).

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

55684820 is a wasteful number, since it uses less digits than its factorization.

55684820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146567 (or 146565 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 38.

The square root of 55684820 is about 7462.2262093828. The cubic root of 55684820 is about 381.8671266535.

The spelling of 55684820 in words is "fifty-five million, six hundred eighty-four thousand, eight hundred twenty".