55236440 has 32 divisors (see below), whose sum is σ = 142037280.
Its totient is φ = 18938112.
The previous prime is 55236437. The next prime is 55236443. The reversal of 55236440 is 4463255.
Adding to 55236440 its reverse (4463255), we get a palindrome (59699695).
It is an interprime number because it is at equal distance from previous prime (55236437) and next prime (55236443).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (55236443) 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, 98357 + ... + 98916.
It is an arithmetic number, because the mean of its divisors is an integer number (4438665).
Almost surely, 255236440 is an apocalyptic number.
It is an amenable number.
55236440 is an abundant number, since it is smaller than the sum of its proper divisors (86800840).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
55236440 is a wasteful number, since it uses less digits than its factorization.
55236440 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 197291 (or 197287 counting only the distinct ones).
The product of its (nonzero) digits is 14400, while the sum is 29.
The square root of 55236440 is about 7432.1221733769.
The cubic root of 55236440 is about 380.8394186003.
The spelling of 55236440 in words is "fifty-five million, two hundred thirty-six thousand, four hundred forty".