55122440 has 16 divisors (see below), whose sum is σ = 124025580. Its totient is φ = 22048960.

The previous prime is 55122437. The next prime is 55122451. The reversal of 55122440 is 4422155.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 52504516 + 2617924 = 7246^2 + 1618^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688991 + ... + 689070.

Almost surely, 2^55122440 is an apocalyptic number.

It is an amenable number.

55122440 is an abundant number, since it is smaller than the sum of its proper divisors (68903140).

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

55122440 is a wasteful number, since it uses less digits than its factorization.

55122440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378072 (or 1378068 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 55122440 is about 7424.4488010895. The cubic root of 55122440 is about 380.5772390445.

Adding to 55122440 its reverse (4422155), we get a palindrome (59544595).

The spelling of 55122440 in words is "fifty-five million, one hundred twenty-two thousand, four hundred forty".