55120422 has 16 divisors (see below), whose sum is σ = 125989632. Its totient is φ = 15748680.

The previous prime is 55120399. The next prime is 55120423. The reversal of 55120422 is 22402155.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55120423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656154 + ... + 656237.

It is an arithmetic number, because the mean of its divisors is an integer number (7874352).

Almost surely, 2^55120422 is an apocalyptic number.

55120422 is an abundant number, since it is smaller than the sum of its proper divisors (70869210).

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

55120422 is a wasteful number, since it uses less digits than its factorization.

55120422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312403.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 55120422 is about 7424.3128975010. The cubic root of 55120422 is about 380.5725947517.

Adding to 55120422 its reverse (22402155), we get a palindrome (77522577).

The spelling of 55120422 in words is "fifty-five million, one hundred twenty thousand, four hundred twenty-two".