55122040 has 128 divisors (see below), whose sum is σ = 140616000. Its totient is φ = 19353600.

The previous prime is 55122037. The next prime is 55122077. The reversal of 55122040 is 4022155.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 55121999 and 55122017.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 903610 + ... + 903670.

Almost surely, 2^55122040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55122040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70308000).

55122040 is an abundant number, since it is smaller than the sum of its proper divisors (85493960).

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

55122040 is a wasteful number, since it uses less digits than its factorization.

55122040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 55122040 is about 7424.4218630140. The cubic root of 55122040 is about 380.5763184801.

Adding to 55122040 its reverse (4022155), we get a palindrome (59144195).

The spelling of 55122040 in words is "fifty-five million, one hundred twenty-two thousand, forty".