55206405 has 48 divisors (see below), whose sum is σ = 99874944. Its totient is φ = 28183680.

The previous prime is 55206391. The next prime is 55206409. The reversal of 55206405 is 50460255.

55206405 is a `hidden beast` number, since 55 + 206 + 405 = 666.

It is not a de Polignac number, because 55206405 - 2⁸ = 55206149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55206409) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 117982 + ... + 118448.

It is an arithmetic number, because the mean of its divisors is an integer number (2080728).

Almost surely, 2^55206405 is an apocalyptic number.

It is an amenable number.

55206405 is a deficient number, since it is larger than the sum of its proper divisors (44668539).

55206405 is a wasteful number, since it uses less digits than its factorization.

55206405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586 (or 583 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 55206405 is about 7430.1012779100. The cubic root of 55206405 is about 380.7703785136.

It can be divided in two parts, 55206 and 405, that added together give a triangular number (55611 = T₃₃₃).

The spelling of 55206405 in words is "fifty-five million, two hundred six thousand, four hundred five".