55728211 has 16 divisors (see below), whose sum is σ = 69954048. Its totient is φ = 43128000.

The previous prime is 55728209. The next prime is 55728217. The reversal of 55728211 is 11282755.

It is a cyclic number.

It is not a de Polignac number, because 55728211 - 2¹ = 55728209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55728217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9231 + ... + 14023.

It is an arithmetic number, because the mean of its divisors is an integer number (4372128).

Almost surely, 2^55728211 is an apocalyptic number.

55728211 is a deficient number, since it is larger than the sum of its proper divisors (14225837).

55728211 is a wasteful number, since it uses less digits than its factorization.

55728211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4962.

The product of its digits is 5600, while the sum is 31.

The square root of 55728211 is about 7465.1330195784. The cubic root of 55728211 is about 381.9662876968.

The spelling of 55728211 in words is "fifty-five million, seven hundred twenty-eight thousand, two hundred eleven".