55805004 has 24 divisors (see below), whose sum is σ = 144679920. Its totient is φ = 18601632.

The previous prime is 55805003. The next prime is 55805011. The reversal of 55805004 is 40050855.

It is a super-2 number, since 2×55805004² = 6228396942880032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (55805003) 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 7 ways as a sum of consecutive naturals, for example, 258249 + ... + 258464.

It is an arithmetic number, because the mean of its divisors is an integer number (6028330).

Almost surely, 2^55805004 is an apocalyptic number.

55805004 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

55805004 is an abundant number, since it is smaller than the sum of its proper divisors (88874916).

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

55805004 is a wasteful number, since it uses less digits than its factorization.

55805004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516726 (or 516718 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 55805004 is about 7470.2746937445. The cubic root of 55805004 is about 382.1416559329.

Adding to 55805004 its reverse (40050855), we get a palindrome (95855859).

The spelling of 55805004 in words is "fifty-five million, eight hundred five thousand, four".