55090140 has 96 divisors (see below), whose sum is σ = 182407680. Its totient is φ = 12155136.

The previous prime is 55090103. The next prime is 55090159. The reversal of 55090140 is 4109055.

It is a self number, because there is not a number n which added to its sum of digits gives 55090140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9919 + ... + 14441.

It is an arithmetic number, because the mean of its divisors is an integer number (1900080).

Almost surely, 2^55090140 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 55090140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91203840).

55090140 is an abundant number, since it is smaller than the sum of its proper divisors (127317540).

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

55090140 is a wasteful number, since it uses less digits than its factorization.

55090140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4571 (or 4569 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 55090140 is about 7422.2732366843. The cubic root of 55090140 is about 380.5028891267.

Adding to 55090140 its reverse (4109055), we get a palindrome (59199195).

The spelling of 55090140 in words is "fifty-five million, ninety thousand, one hundred forty".