55051540 has 24 divisors (see below), whose sum is σ = 116673480. Its totient is φ = 21817728.

The previous prime is 55051537. The next prime is 55051583. The reversal of 55051540 is 4515055.

It can be written as a sum of positive squares in 4 ways, for example, as 23309584 + 31741956 = 4828^2 + 5634^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10447 + ... + 14806.

It is an arithmetic number, because the mean of its divisors is an integer number (4861395).

Almost surely, 2^55051540 is an apocalyptic number.

It is an amenable number.

55051540 is an abundant number, since it is smaller than the sum of its proper divisors (61621940).

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

55051540 is a wasteful number, since it uses less digits than its factorization.

55051540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25371 (or 25369 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 55051540 is about 7419.6724995110. The cubic root of 55051540 is about 380.4139993956.

Adding to 55051540 its reverse (4515055), we get a palindrome (59566595).

The spelling of 55051540 in words is "fifty-five million, fifty-one thousand, five hundred forty".