55552440 has 32 divisors (see below), whose sum is σ = 166657680. Its totient is φ = 14813952.

The previous prime is 55552439. The next prime is 55552451. The reversal of 55552440 is 4425555.

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 = 55552398 and 55552407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231349 + ... + 231588.

Almost surely, 2^55552440 is an apocalyptic number.

It is an amenable number.

55552440 is an abundant number, since it is smaller than the sum of its proper divisors (111105240).

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

55552440 is a wasteful number, since it uses less digits than its factorization.

55552440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462951 (or 462947 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 30.

The square root of 55552440 is about 7453.3509242488. The cubic root of 55552440 is about 381.5642812095.

Adding to 55552440 its reverse (4425555), we get a palindrome (59977995).

The spelling of 55552440 in words is "fifty-five million, five hundred fifty-two thousand, four hundred forty".