28402317 has 24 divisors (see below), whose sum is σ = 42556800. Its totient is φ = 18240768.

The previous prime is 28402313. The next prime is 28402331. The reversal of 28402317 is 71320482.

It is not a de Polignac number, because 28402317 - 2² = 28402313 is a prime.

It is a super-2 number, since 2×28402317² = 1613383221936978, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28402313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30109 + ... + 31037.

It is an arithmetic number, because the mean of its divisors is an integer number (1773200).

Almost surely, 2^28402317 is an apocalyptic number.

It is an amenable number.

28402317 is a deficient number, since it is larger than the sum of its proper divisors (14154483).

28402317 is a wasteful number, since it uses less digits than its factorization.

28402317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057 (or 1054 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 28402317 is about 5329.3824220073. The cubic root of 28402317 is about 305.1063572461.

Adding to 28402317 its reverse (71320482), we get a palindrome (99722799).

The spelling of 28402317 in words is "twenty-eight million, four hundred two thousand, three hundred seventeen".