5551240440 has 128 divisors (see below), whose sum is σ = 17414300160. Its totient is φ = 1412995584.

The previous prime is 5551240433. The next prime is 5551240441. The reversal of 5551240440 is 440421555.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 5551240398 and 5551240407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5551240441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1507882 + ... + 1511558.

It is an arithmetic number, because the mean of its divisors is an integer number (136049220).

Almost surely, 2^5551240440 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 5551240440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8707150080).

5551240440 is an abundant number, since it is smaller than the sum of its proper divisors (11863059720).

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

5551240440 is a wasteful number, since it uses less digits than its factorization.

5551240440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4261 (or 4257 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

The square root of 5551240440 is about 74506.6469517989. The cubic root of 5551240440 is about 1770.6389470793.

Adding to 5551240440 its reverse (440421555), we get a palindrome (5991661995).

The spelling of 5551240440 in words is "five billion, five hundred fifty-one million, two hundred forty thousand, four hundred forty".