55109520 has 60 divisors (see below), whose sum is σ = 185078556. Its totient is φ = 14695680.

The previous prime is 55109513. The next prime is 55109533. The reversal of 55109520 is 2590155.

55109520 is a `hidden beast` number, since 551 + 0 + 95 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15116544 + 39992976 = 3888^2 + 6324^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37551 + ... + 38990.

Almost surely, 2^55109520 is an apocalyptic number.

It is an amenable number.

55109520 is an abundant number, since it is smaller than the sum of its proper divisors (129969036).

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

55109520 is a wasteful number, since it uses less digits than its factorization.

55109520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76560 (or 76551 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 55109520 is about 7423.5786518363. The cubic root of 55109520 is about 380.5475025636.

Adding to 55109520 its reverse (2590155), we get a palindrome (57699675).

The spelling of 55109520 in words is "fifty-five million, one hundred nine thousand, five hundred twenty".