55323840 has 336 divisors, whose sum is σ = 214189056. Its totient is φ = 11980800.

The previous prime is 55323823. The next prime is 55323859. The reversal of 55323840 is 4832355.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55323798 and 55323807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1784625 + ... + 1784655.

Almost surely, 2^55323840 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 55323840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107094528).

55323840 is an abundant number, since it is smaller than the sum of its proper divisors (158865216).

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

55323840 is a wasteful number, since it uses less digits than its factorization.

55323840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 55323840 is about 7437.9997311105. Note that the first 3 decimals coincide. The cubic root of 55323840 is about 381.0401787320.

The spelling of 55323840 in words is "fifty-five million, three hundred twenty-three thousand, eight hundred forty".