28655761 has 8 divisors (see below), whose sum is σ = 31082184. Its totient is φ = 26311680.

The previous prime is 28655747. The next prime is 28655771. The reversal of 28655761 is 16755682.

It can be written as a sum of positive squares in 4 ways, for example, as 4596736 + 24059025 = 2144^2 + 4905^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28655761 - 2⁷ = 28655633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28655771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19860 + ... + 21253.

It is an arithmetic number, because the mean of its divisors is an integer number (3885273).

Almost surely, 2^28655761 is an apocalyptic number.

It is an amenable number.

28655761 is a deficient number, since it is larger than the sum of its proper divisors (2426423).

28655761 is a wasteful number, since it uses less digits than its factorization.

28655761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41171.

The product of its digits is 100800, while the sum is 40.

The square root of 28655761 is about 5353.1076021317. The cubic root of 28655761 is about 306.0111954268.

The spelling of 28655761 in words is "twenty-eight million, six hundred fifty-five thousand, seven hundred sixty-one".