55800321 has 16 divisors (see below), whose sum is σ = 81019200. Its totient is φ = 34026048.

The previous prime is 55800313. The next prime is 55800331. The reversal of 55800321 is 12300855.

It is not a de Polignac number, because 55800321 - 2³ = 55800313 is a prime.

It is a super-2 number, since 2×55800321² = 6227351647406082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55800291 and 55800300.

It is not an unprimeable number, because it can be changed into a prime (55800331) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 15226 + ... + 18531.

It is an arithmetic number, because the mean of its divisors is an integer number (5063700).

Almost surely, 2^55800321 is an apocalyptic number.

It is an amenable number.

55800321 is a deficient number, since it is larger than the sum of its proper divisors (25218879).

55800321 is a wasteful number, since it uses less digits than its factorization.

55800321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33808.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 55800321 is about 7469.9612448794. The cubic root of 55800321 is about 382.1309662139.

The spelling of 55800321 in words is "fifty-five million, eight hundred thousand, three hundred twenty-one".