55555520 has 56 divisors (see below), whose sum is σ = 133350000. Its totient is φ = 22044672.

The previous prime is 55555517. The next prime is 55555523. The reversal of 55555520 is 2555555.

It is an interprime number because it is at equal distance from previous prime (55555517) and next prime (55555523).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55555523) 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, 43856 + ... + 45104.

It is an arithmetic number, because the mean of its divisors is an integer number (2381250).

Almost surely, 2^55555520 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 55555520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66675000).

55555520 is an abundant number, since it is smaller than the sum of its proper divisors (77794480).

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

55555520 is a wasteful number, since it uses less digits than its factorization.

55555520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405 (or 1395 counting only the distinct ones).

The product of its (nonzero) digits is 31250, while the sum is 32.

The square root of 55555520 is about 7453.5575398597. The cubic root of 55555520 is about 381.5713327825.

The spelling of 55555520 in words is "fifty-five million, five hundred fifty-five thousand, five hundred twenty".