28331345 has 16 divisors (see below), whose sum is σ = 39087360. Its totient is φ = 19310784.

The previous prime is 28331341. The next prime is 28331357. The reversal of 28331345 is 54313382.

28331345 = T₃₅ + T₃₆ + ... + T₅₅₃.

It is a cyclic number.

It is not a de Polignac number, because 28331345 - 2² = 28331341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28331341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3716 + ... + 8394.

It is an arithmetic number, because the mean of its divisors is an integer number (2442960).

Almost surely, 2^28331345 is an apocalyptic number.

It is an amenable number.

28331345 is a deficient number, since it is larger than the sum of its proper divisors (10756015).

28331345 is a wasteful number, since it uses less digits than its factorization.

28331345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4864.

The product of its digits is 8640, while the sum is 29.

The square root of 28331345 is about 5322.7196995521. The cubic root of 28331345 is about 304.8520109793.

The spelling of 28331345 in words is "twenty-eight million, three hundred thirty-one thousand, three hundred forty-five".