55728340 has 12 divisors (see below), whose sum is σ = 117029556. Its totient is φ = 22291328.

The previous prime is 55728331. The next prime is 55728341. The reversal of 55728340 is 4382755.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15634116 + 40094224 = 3954^2 + 6332^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55728296 and 55728305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55728341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1393189 + ... + 1393228.

It is an arithmetic number, because the mean of its divisors is an integer number (9752463).

Almost surely, 2^55728340 is an apocalyptic number.

It is an amenable number.

55728340 is an abundant number, since it is smaller than the sum of its proper divisors (61301216).

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

55728340 is a wasteful number, since it uses less digits than its factorization.

55728340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2786426 (or 2786424 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 55728340 is about 7465.1416597410. The cubic root of 55728340 is about 381.9665824225.

The spelling of 55728340 in words is "fifty-five million, seven hundred twenty-eight thousand, three hundred forty".