55428820 has 24 divisors (see below), whose sum is σ = 116540424. Its totient is φ = 22144896.

The previous prime is 55428817. The next prime is 55428829. The reversal of 55428820 is 2882455.

It can be written as a sum of positive squares in 4 ways, for example, as 104976 + 55323844 = 324^2 + 7438^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55428829) 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, 31894 + ... + 33586.

It is an arithmetic number, because the mean of its divisors is an integer number (4855851).

Almost surely, 2^55428820 is an apocalyptic number.

It is an amenable number.

55428820 is an abundant number, since it is smaller than the sum of its proper divisors (61111604).

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

55428820 is a wasteful number, since it uses less digits than its factorization.

55428820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3339 (or 3337 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 34.

The square root of 55428820 is about 7445.0533913465. The cubic root of 55428820 is about 381.2810412780.

It can be divided in two parts, 5 and 5428820, that multiplied together give a square (27144100 = 5210²).

The spelling of 55428820 in words is "fifty-five million, four hundred twenty-eight thousand, eight hundred twenty".