55487220 has 48 divisors (see below), whose sum is σ = 163544640. Its totient is φ = 14017536.

The previous prime is 55487207. The next prime is 55487221. The reversal of 55487220 is 2278455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55487221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23197 + ... + 25476.

It is an arithmetic number, because the mean of its divisors is an integer number (3407180).

Almost surely, 2^55487220 is an apocalyptic number.

It is an amenable number.

55487220 is an abundant number, since it is smaller than the sum of its proper divisors (108057420).

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

55487220 is a wasteful number, since it uses less digits than its factorization.

55487220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48704 (or 48702 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 55487220 is about 7448.9744260536. The cubic root of 55487220 is about 381.4149006268.

The spelling of 55487220 in words is "fifty-five million, four hundred eighty-seven thousand, two hundred twenty".