28061577 has 24 divisors (see below), whose sum is σ = 44086536. Its totient is φ = 17127936.

The previous prime is 28061569. The next prime is 28061597. The reversal of 28061577 is 77516082.

28061577 is a `hidden beast` number, since 2 + 80 + 6 + 1 + 577 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 18844281 + 9217296 = 4341^2 + 3036^2 .

It is not a de Polignac number, because 28061577 - 2³ = 28061569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28061557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3183 + ... + 8139.

It is an arithmetic number, because the mean of its divisors is an integer number (1836939).

Almost surely, 2^28061577 is an apocalyptic number.

It is an amenable number.

28061577 is a deficient number, since it is larger than the sum of its proper divisors (16024959).

28061577 is a wasteful number, since it uses less digits than its factorization.

28061577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5017 (or 5014 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 28061577 is about 5297.3179062616. The cubic root of 28061577 is about 303.8813342541.

The spelling of 28061577 in words is "twenty-eight million, sixty-one thousand, five hundred seventy-seven".