28561247 has 8 divisors (see below), whose sum is σ = 33554640. Its totient is φ = 23967360.

The previous prime is 28561243. The next prime is 28561249. The reversal of 28561247 is 74216582.

28561247 = 374² + 375² + ... + 516².

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 28561247 - 2² = 28561243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28561243) 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, 99722 + ... + 100007.

It is an arithmetic number, because the mean of its divisors is an integer number (4194330).

Almost surely, 2^28561247 is an apocalyptic number.

28561247 is a deficient number, since it is larger than the sum of its proper divisors (4993393).

28561247 is a wasteful number, since it uses less digits than its factorization.

28561247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199753.

The product of its digits is 26880, while the sum is 35.

The square root of 28561247 is about 5344.2723545867. The cubic root of 28561247 is about 305.6743905719.

The spelling of 28561247 in words is "twenty-eight million, five hundred sixty-one thousand, two hundred forty-seven".