55810428 has 12 divisors (see below), whose sum is σ = 130224360. Its totient is φ = 18603472.

The previous prime is 55810427. The next prime is 55810457. The reversal of 55810428 is 82401855.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×55810428² = 6229607747086368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55810423) 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, 2325423 + ... + 2325446.

It is an arithmetic number, because the mean of its divisors is an integer number (10852030).

Almost surely, 2^55810428 is an apocalyptic number.

It is an amenable number.

55810428 is an abundant number, since it is smaller than the sum of its proper divisors (74413932).

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

55810428 is a wasteful number, since it uses less digits than its factorization.

55810428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4650876 (or 4650874 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 55810428 is about 7470.6377237824. The cubic root of 55810428 is about 382.1540363591.

The spelling of 55810428 in words is "fifty-five million, eight hundred ten thousand, four hundred twenty-eight".