55555420 has 12 divisors (see below), whose sum is σ = 116666424. Its totient is φ = 22222160.

The previous prime is 55555399. The next prime is 55555429. The reversal of 55555420 is 2455555.

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 (55555429) 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, 1388866 + ... + 1388905.

It is an arithmetic number, because the mean of its divisors is an integer number (9722202).

Almost surely, 2^55555420 is an apocalyptic number.

It is an amenable number.

55555420 is an abundant number, since it is smaller than the sum of its proper divisors (61111004).

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

55555420 is a wasteful number, since it uses less digits than its factorization.

55555420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777780 (or 2777778 counting only the distinct ones).

The product of its (nonzero) digits is 25000, while the sum is 31.

The square root of 55555420 is about 7453.5508316506. The cubic root of 55555420 is about 381.5711038394.

The spelling of 55555420 in words is "fifty-five million, five hundred fifty-five thousand, four hundred twenty".