55299920 has 40 divisors (see below), whose sum is σ = 138465096. Its totient is φ = 20418048.

The previous prime is 55299917. The next prime is 55299931. The reversal of 55299920 is 2999255.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1658944 + 53640976 = 1288^2 + 7324^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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, 25547 + ... + 27626.

Almost surely, 2^55299920 is an apocalyptic number.

It is an amenable number.

55299920 is an abundant number, since it is smaller than the sum of its proper divisors (83165176).

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

55299920 is a wasteful number, since it uses less digits than its factorization.

55299920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53199 (or 53193 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 55299920 is about 7436.3915980803. The cubic root of 55299920 is about 380.9852548813.

It can be divided in two parts, 5 and 5299920, that added together give a palindrome (5299925).

The spelling of 55299920 in words is "fifty-five million, two hundred ninety-nine thousand, nine hundred twenty".