55030140 has 72 divisors (see below), whose sum is σ = 182106288. Its totient is φ = 13340160.

The previous prime is 55030051. The next prime is 55030163. The reversal of 55030140 is 4103055.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11917 + ... + 15876.

It is an arithmetic number, because the mean of its divisors is an integer number (2529254).

Almost surely, 2^55030140 is an apocalyptic number.

It is an amenable number.

55030140 is an abundant number, since it is smaller than the sum of its proper divisors (127076148).

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

55030140 is a wasteful number, since it uses less digits than its factorization.

55030140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27819 (or 27814 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 55030140 is about 7418.2302471681. The cubic root of 55030140 is about 380.3647006556.

Adding to 55030140 its reverse (4103055), we get a palindrome (59133195).

The spelling of 55030140 in words is "fifty-five million, thirty thousand, one hundred forty".