55520405 has 8 divisors (see below), whose sum is σ = 66911832. Its totient is φ = 44224768.

The previous prime is 55520401. The next prime is 55520441. The reversal of 55520405 is 50402555.

It can be written as a sum of positive squares in 4 ways, for example, as 4726276 + 50794129 = 2174^2 + 7127^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 55520405 - 2² = 55520401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55520401) 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, 22664 + ... + 24993.

It is an arithmetic number, because the mean of its divisors is an integer number (8363979).

Almost surely, 2^55520405 is an apocalyptic number.

It is an amenable number.

55520405 is a deficient number, since it is larger than the sum of its proper divisors (11391427).

55520405 is a wasteful number, since it uses less digits than its factorization.

55520405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47895.

The product of its (nonzero) digits is 5000, while the sum is 26.

The square root of 55520405 is about 7451.2015809532. The cubic root of 55520405 is about 381.4909225229.

The spelling of 55520405 in words is "fifty-five million, five hundred twenty thousand, four hundred five".