55728973 has 2 divisors, whose sum is σ = 55728974. Its totient is φ = 55728972.

The previous prime is 55728961. The next prime is 55729007. The reversal of 55728973 is 37982755.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39904489 + 15824484 = 6317^2 + 3978^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55728973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55728073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27864486 + 27864487.

It is an arithmetic number, because the mean of its divisors is an integer number (27864487).

Almost surely, 2^55728973 is an apocalyptic number.

It is an amenable number.

55728973 is a deficient number, since it is larger than the sum of its proper divisors (1).

55728973 is an equidigital number, since it uses as much as digits as its factorization.

55728973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 529200, while the sum is 46.

The square root of 55728973 is about 7465.1840566727. The cubic root of 55728973 is about 381.9680286282.

It can be divided in two parts, 55 and 728973, that added together give a triangular number (729028 = T₁₂₀₇).

The spelling of 55728973 in words is "fifty-five million, seven hundred twenty-eight thousand, nine hundred seventy-three".