55321400 has 96 divisors (see below), whose sum is σ = 139209840. Its totient is φ = 20367360.

The previous prime is 55321367. The next prime is 55321429. The reversal of 55321400 is 412355.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180047 + ... + 180353.

Almost surely, 2^55321400 is an apocalyptic number.

55321400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55321400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69604920).

55321400 is an abundant number, since it is smaller than the sum of its proper divisors (83888440).

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

55321400 is a wasteful number, since it uses less digits than its factorization.

55321400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 55321400 is about 7437.8357067093. The cubic root of 55321400 is about 381.0345768570.

Adding to 55321400 its reverse (412355), we get a palindrome (55733755).

The spelling of 55321400 in words is "fifty-five million, three hundred twenty-one thousand, four hundred".