55511240 has 16 divisors (see below), whose sum is σ = 124900380. Its totient is φ = 22204480.

The previous prime is 55511231. The next prime is 55511243. The reversal of 55511240 is 4211555.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 47637604 + 7873636 = 6902^2 + 2806^2 .

It is not an unprimeable number, because it can be changed into a prime (55511243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693851 + ... + 693930.

Almost surely, 2^55511240 is an apocalyptic number.

It is an amenable number.

55511240 is an abundant number, since it is smaller than the sum of its proper divisors (69389140).

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

55511240 is a wasteful number, since it uses less digits than its factorization.

55511240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387792 (or 1387788 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 55511240 is about 7450.5865540909. The cubic root of 55511240 is about 381.4699299004.

Adding to 55511240 its reverse (4211555), we get a palindrome (59722795).

The spelling of 55511240 in words is "fifty-five million, five hundred eleven thousand, two hundred forty".