55501840 has 40 divisors (see below), whose sum is σ = 129788568. Its totient is φ = 22072320.

The previous prime is 55501807. The next prime is 55501841. The reversal of 55501840 is 4810555.

It can be written as a sum of positive squares in 4 ways, for example, as 1567504 + 53934336 = 1252^2 + 7344^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 55501799 and 55501808.

It is not an unprimeable number, because it can be changed into a prime (55501841) by changing a digit.

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, 12564 + ... + 16396.

Almost surely, 2^55501840 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 55501840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64894284).

55501840 is an abundant number, since it is smaller than the sum of its proper divisors (74286728).

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

55501840 is a wasteful number, since it uses less digits than its factorization.

55501840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4027 (or 4021 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 55501840 is about 7449.9557045663. The cubic root of 55501840 is about 381.4483966052.

The spelling of 55501840 in words is "fifty-five million, five hundred one thousand, eight hundred forty".