55490232 has 128 divisors (see below), whose sum is σ = 166348800. Its totient is φ = 15095808.

The previous prime is 55490207. The next prime is 55490233. The reversal of 55490232 is 23209455.

55490232 = 644² + 645² + ... + 756².

It is a self number, because there is not a number n which added to its sum of digits gives 55490232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55490233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 491008 + ... + 491120.

It is an arithmetic number, because the mean of its divisors is an integer number (1299600).

Almost surely, 2^55490232 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 55490232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83174400).

55490232 is an abundant number, since it is smaller than the sum of its proper divisors (110858568).

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

55490232 is a wasteful number, since it uses less digits than its factorization.

55490232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 55490232 is about 7449.1765987926. The cubic root of 55490232 is about 381.4218019210.

Adding to 55490232 its reverse (23209455), we get a palindrome (78699687).

The spelling of 55490232 in words is "fifty-five million, four hundred ninety thousand, two hundred thirty-two".