55445620 has 12 divisors (see below), whose sum is σ = 116435844. Its totient is φ = 22178240.

The previous prime is 55445609. The next prime is 55445633. The reversal of 55445620 is 2654455.

It can be written as a sum of positive squares in 2 ways, for example, as 19589476 + 35856144 = 4426^2 + 5988^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1386121 + ... + 1386160.

It is an arithmetic number, because the mean of its divisors is an integer number (9702987).

Almost surely, 2^55445620 is an apocalyptic number.

It is an amenable number.

55445620 is an abundant number, since it is smaller than the sum of its proper divisors (60990224).

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

55445620 is a wasteful number, since it uses less digits than its factorization.

55445620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2772290 (or 2772288 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 55445620 is about 7446.1815717856. The cubic root of 55445620 is about 381.3195583915.

It can be divided in two parts, 55445 and 620, that added together give a palindrome (56065).

The spelling of 55445620 in words is "fifty-five million, four hundred forty-five thousand, six hundred twenty".