55520440 has 16 divisors (see below), whose sum is σ = 124921080. Its totient is φ = 22208160.

The previous prime is 55520401. The next prime is 55520441. The reversal of 55520440 is 4402555.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55520441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693966 + ... + 694045.

Almost surely, 2^55520440 is an apocalyptic number.

It is an amenable number.

55520440 is an abundant number, since it is smaller than the sum of its proper divisors (69400640).

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

55520440 is a wasteful number, since it uses less digits than its factorization.

55520440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388022 (or 1388018 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 55520440 is about 7451.2039295674. The cubic root of 55520440 is about 381.4910026867.

Adding to 55520440 its reverse (4402555), we get a palindrome (59922995).

The spelling of 55520440 in words is "fifty-five million, five hundred twenty thousand, four hundred forty".