55520556 has 72 divisors (see below), whose sum is σ = 160360704. Its totient is φ = 14639040.

The previous prime is 55520539. The next prime is 55520557. The reversal of 55520556 is 65502555.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55520557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12241 + ... + 16151.

It is an arithmetic number, because the mean of its divisors is an integer number (2227232).

Almost surely, 2^55520556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55520556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80180352).

55520556 is an abundant number, since it is smaller than the sum of its proper divisors (104840148).

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

55520556 is a wasteful number, since it uses less digits than its factorization.

55520556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3951 (or 3936 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 33.

The square root of 55520556 is about 7451.2117135403. The cubic root of 55520556 is about 381.4912683722.

The spelling of 55520556 in words is "fifty-five million, five hundred twenty thousand, five hundred fifty-six".