28331247 has 16 divisors (see below), whose sum is σ = 43557120. Its totient is φ = 16044672.

The previous prime is 28331209. The next prime is 28331249. The reversal of 28331247 is 74213382.

It is not a de Polignac number, because 28331247 - 2¹⁰ = 28330223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28331249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3597 + ... + 8342.

It is an arithmetic number, because the mean of its divisors is an integer number (2722320).

Almost surely, 2^28331247 is an apocalyptic number.

28331247 is a deficient number, since it is larger than the sum of its proper divisors (15225873).

28331247 is a wasteful number, since it uses less digits than its factorization.

28331247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12062.

The product of its digits is 8064, while the sum is 30.

The square root of 28331247 is about 5322.7104937240. The cubic root of 28331247 is about 304.8516594778.

The spelling of 28331247 in words is "twenty-eight million, three hundred thirty-one thousand, two hundred forty-seven".