55819530 has 224 divisors, whose sum is σ = 176279040. Its totient is φ = 12597120.

The previous prime is 55819529. The next prime is 55819553. The reversal of 55819530 is 3591855.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 1800615 + ... + 1800645.

It is an arithmetic number, because the mean of its divisors is an integer number (786960).

Almost surely, 2^55819530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55819530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88139520).

55819530 is an abundant number, since it is smaller than the sum of its proper divisors (120459510).

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

55819530 is a wasteful number, since it uses less digits than its factorization.

55819530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 73 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 55819530 is about 7471.2468838876. The cubic root of 55819530 is about 382.1748101170.

The spelling of 55819530 in words is "fifty-five million, eight hundred nineteen thousand, five hundred thirty".