55315440 has 80 divisors (see below), whose sum is σ = 190538400. Its totient is φ = 14750208.

The previous prime is 55315427. The next prime is 55315451. The reversal of 55315440 is 4451355.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10645 + ... + 14964.

It is an arithmetic number, because the mean of its divisors is an integer number (2381730).

Almost surely, 2^55315440 is an apocalyptic number.

It is an amenable number.

55315440 is an abundant number, since it is smaller than the sum of its proper divisors (135222960).

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

55315440 is a wasteful number, since it uses less digits than its factorization.

55315440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25631 (or 25619 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 55315440 is about 7437.4350417331. The cubic root of 55315440 is about 381.0208928961.

Adding to 55315440 its reverse (4451355), we get a palindrome (59766795).

It can be divided in two parts, 55315 and 440, that added together give a palindrome (55755).

The spelling of 55315440 in words is "fifty-five million, three hundred fifteen thousand, four hundred forty".