55572440 has 64 divisors (see below), whose sum is σ = 155900160. Its totient is φ = 17320320.

The previous prime is 55572373. The next prime is 55572443. The reversal of 55572440 is 4427555.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 55572397 and 55572406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55572443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5942 + ... + 12101.

It is an arithmetic number, because the mean of its divisors is an integer number (2435940).

Almost surely, 2^55572440 is an apocalyptic number.

It is an amenable number.

55572440 is an abundant number, since it is smaller than the sum of its proper divisors (100327720).

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

55572440 is a wasteful number, since it uses less digits than its factorization.

55572440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18072 (or 18068 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 32.

The square root of 55572440 is about 7454.6924819204. The cubic root of 55572440 is about 381.6100659971.

Adding to 55572440 its reverse (4427555), we get a palindrome (59999995).

It can be divided in two parts, 5557 and 2440, that added together give a palindrome (7997).

The spelling of 55572440 in words is "fifty-five million, five hundred seventy-two thousand, four hundred forty".