55821073 has 8 divisors (see below), whose sum is σ = 69595200. Its totient is φ = 43496880.

The previous prime is 55821043. The next prime is 55821089. The reversal of 55821073 is 37012855.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55821073 - 2⁹ = 55820561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55821043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362398 + ... + 362551.

It is an arithmetic number, because the mean of its divisors is an integer number (8699400).

Almost surely, 2^55821073 is an apocalyptic number.

It is an amenable number.

55821073 is a deficient number, since it is larger than the sum of its proper divisors (13774127).

55821073 is a wasteful number, since it uses less digits than its factorization.

55821073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724967.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 55821073 is about 7471.3501457233. The cubic root of 55821073 is about 382.1783315266.

It can be divided in two parts, 55 and 821073, that added together give a palindrome (821128).

The spelling of 55821073 in words is "fifty-five million, eight hundred twenty-one thousand, seventy-three".