55311340 has 48 divisors (see below), whose sum is σ = 134148672. Its totient is φ = 18763776.

The previous prime is 55311331. The next prime is 55311349. The reversal of 55311340 is 4311355.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55311331) and next prime (55311349).

It is not an unprimeable number, because it can be changed into a prime (55311349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11544 + ... + 15616.

It is an arithmetic number, because the mean of its divisors is an integer number (2794764).

Almost surely, 2^55311340 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 55311340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67074336).

55311340 is an abundant number, since it is smaller than the sum of its proper divisors (78837332).

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

55311340 is a wasteful number, since it uses less digits than its factorization.

55311340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4186 (or 4184 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 55311340 is about 7437.1594039660. The cubic root of 55311340 is about 381.0114788623.

Adding to 55311340 its reverse (4311355), we get a palindrome (59622695).

The spelling of 55311340 in words is "fifty-five million, three hundred eleven thousand, three hundred forty".