55320405 has 32 divisors (see below), whose sum is σ = 105560064. Its totient is φ = 24188736.

The previous prime is 55320379. The next prime is 55320409. The reversal of 55320405 is 50402355.

It is not a de Polignac number, because 55320405 - 2⁶ = 55320341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55320409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9039 + ... + 13868.

It is an arithmetic number, because the mean of its divisors is an integer number (3298752).

Almost surely, 2^55320405 is an apocalyptic number.

It is an amenable number.

55320405 is a deficient number, since it is larger than the sum of its proper divisors (50239659).

55320405 is a wasteful number, since it uses less digits than its factorization.

55320405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22945.

The product of its (nonzero) digits is 3000, while the sum is 24.

The square root of 55320405 is about 7437.7688186714. The cubic root of 55320405 is about 381.0322924386.

The spelling of 55320405 in words is "fifty-five million, three hundred twenty thousand, four hundred five".