55253840 has 20 divisors (see below), whose sum is σ = 128465364. Its totient is φ = 22101504.

The previous prime is 55253827. The next prime is 55253867. The reversal of 55253840 is 4835255.

It can be written as a sum of positive squares in 2 ways, for example, as 33500944 + 21752896 = 5788^2 + 4664^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 55253797 and 55253806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345257 + ... + 345416.

Almost surely, 2^55253840 is an apocalyptic number.

It is an amenable number.

55253840 is an abundant number, since it is smaller than the sum of its proper divisors (73211524).

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

55253840 is a wasteful number, since it uses less digits than its factorization.

55253840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690686 (or 690680 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 55253840 is about 7433.2926755241. The cubic root of 55253840 is about 380.8794037393.

The spelling of 55253840 in words is "fifty-five million, two hundred fifty-three thousand, eight hundred forty".