28703561 has 8 divisors (see below), whose sum is σ = 29164800. Its totient is φ = 28245888.

The previous prime is 28703513. The next prime is 28703569. The reversal of 28703561 is 16530782.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28703561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28703569) 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, 18560 + ... + 20046.

It is an arithmetic number, because the mean of its divisors is an integer number (3645600).

Almost surely, 2^28703561 is an apocalyptic number.

It is an amenable number.

28703561 is a deficient number, since it is larger than the sum of its proper divisors (461239).

28703561 is a wasteful number, since it uses less digits than its factorization.

28703561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 28703561 is about 5357.5704381744. The cubic root of 28703561 is about 306.1812509291.

The spelling of 28703561 in words is "twenty-eight million, seven hundred three thousand, five hundred sixty-one".