55140540 has 96 divisors (see below), whose sum is σ = 190041600. Its totient is φ = 11632896.

The previous prime is 55140539. The next prime is 55140551. The reversal of 55140540 is 4504155.

It is a self number, because there is not a number n which added to its sum of digits gives 55140540.

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, 411 + ... + 10509.

It is an arithmetic number, because the mean of its divisors is an integer number (1979600).

Almost surely, 2^55140540 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 55140540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95020800).

55140540 is an abundant number, since it is smaller than the sum of its proper divisors (134901060).

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

55140540 is a wasteful number, since it uses less digits than its factorization.

55140540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10131 (or 10129 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 55140540 is about 7425.6676467507. The cubic root of 55140540 is about 380.6188899232.

Adding to 55140540 its reverse (4504155), we get a palindrome (59644695).

The spelling of 55140540 in words is "fifty-five million, one hundred forty thousand, five hundred forty".