55454440 has 16 divisors (see below), whose sum is σ = 124772580. Its totient is φ = 22181760.

The previous prime is 55454431. The next prime is 55454461. The reversal of 55454440 is 4445455.

It is a happy number.

55454440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 55026724 + 427716 = 7418^2 + 654^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693141 + ... + 693220.

Almost surely, 2^55454440 is an apocalyptic number.

It is an amenable number.

55454440 is an abundant number, since it is smaller than the sum of its proper divisors (69318140).

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

55454440 is a wasteful number, since it uses less digits than its factorization.

55454440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386372 (or 1386368 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 31.

The square root of 55454440 is about 7446.7737980954. The cubic root of 55454440 is about 381.3397767615.

Adding to 55454440 its reverse (4445455), we get a palindrome (59899895).

The spelling of 55454440 in words is "fifty-five million, four hundred fifty-four thousand, four hundred forty".