55649728 has 28 divisors (see below), whose sum is σ = 110669832. Its totient is φ = 27764480.

The previous prime is 55649723. The next prime is 55649747. The reversal of 55649728 is 82794655.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

Its product of digits (604800) is a multiple of the sum of its prime divisors (1890).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55649723) 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, 50463 + ... + 51553.

It is an arithmetic number, because the mean of its divisors is an integer number (3952494).

Almost surely, 2^55649728 is an apocalyptic number.

It is an amenable number.

55649728 is a deficient number, since it is larger than the sum of its proper divisors (55020104).

55649728 is a wasteful number, since it uses less digits than its factorization.

55649728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900 (or 1890 counting only the distinct ones).

The product of its digits is 604800, while the sum is 46.

The square root of 55649728 is about 7459.8745297760. The cubic root of 55649728 is about 381.7868935538.

The spelling of 55649728 in words is "fifty-five million, six hundred forty-nine thousand, seven hundred twenty-eight".