54128749 has 4 divisors (see below), whose sum is σ = 54321660. Its totient is φ = 53935840.

The previous prime is 54128719. The next prime is 54128771. The reversal of 54128749 is 94782145.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29626249 + 24502500 = 5443^2 + 4950^2 .

It is a cyclic number.

It is not a de Polignac number, because 54128749 - 2⁷ = 54128621 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54128719) 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, 96034 + ... + 96595.

It is an arithmetic number, because the mean of its divisors is an integer number (13580415).

Almost surely, 2^54128749 is an apocalyptic number.

It is an amenable number.

54128749 is a deficient number, since it is larger than the sum of its proper divisors (192911).

54128749 is a wasteful number, since it uses less digits than its factorization.

54128749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192910.

The product of its digits is 80640, while the sum is 40.

The square root of 54128749 is about 7357.2242727811. The cubic root of 54128749 is about 378.2764720555.

It can be divided in two parts, 5412 and 8749, that added together give a square (14161 = 119²).

The spelling of 54128749 in words is "fifty-four million, one hundred twenty-eight thousand, seven hundred forty-nine".