55440030 has 32 divisors (see below), whose sum is σ = 133668864. Its totient is φ = 14715936.

The previous prime is 55440013. The next prime is 55440031. The reversal of 55440030 is 3004455.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 55439979 and 55440006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55440031) 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, 2547 + ... + 10833.

It is an arithmetic number, because the mean of its divisors is an integer number (4177152).

Almost surely, 2^55440030 is an apocalyptic number.

55440030 is an abundant number, since it is smaller than the sum of its proper divisors (78228834).

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

55440030 is a wasteful number, since it uses less digits than its factorization.

55440030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8520.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 55440030 is about 7445.8062021517. The cubic root of 55440030 is about 381.3067431443.

Adding to 55440030 its reverse (3004455), we get a palindrome (58444485).

The spelling of 55440030 in words is "fifty-five million, four hundred forty thousand, thirty".