55870820 has 24 divisors (see below), whose sum is σ = 121375800. Its totient is φ = 21577472.

The previous prime is 55870781. The next prime is 55870847. The reversal of 55870820 is 2807855.

It can be written as a sum of positive squares in 4 ways, for example, as 3655744 + 52215076 = 1912^2 + 7226^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47585 + ... + 48744.

It is an arithmetic number, because the mean of its divisors is an integer number (5057325).

Almost surely, 2^55870820 is an apocalyptic number.

It is an amenable number.

55870820 is an abundant number, since it is smaller than the sum of its proper divisors (65504980).

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

55870820 is a wasteful number, since it uses less digits than its factorization.

55870820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96367 (or 96365 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 35.

The square root of 55870820 is about 7474.6785884077. The cubic root of 55870820 is about 382.2918285713.

The spelling of 55870820 in words is "fifty-five million, eight hundred seventy thousand, eight hundred twenty".