28347137 has 12 divisors (see below), whose sum is σ = 35512596. Its totient is φ = 22428000.

The previous prime is 28347133. The next prime is 28347139. The reversal of 28347137 is 73174382.

It can be written as a sum of positive squares in 2 ways, for example, as 10233601 + 18113536 = 3199^2 + 4256^2 .

It is not a de Polignac number, because 28347137 - 2² = 28347133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28347097 and 28347106.

It is not an unprimeable number, because it can be changed into a prime (28347131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21614 + ... + 22887.

It is an arithmetic number, because the mean of its divisors is an integer number (2959383).

Almost surely, 2^28347137 is an apocalyptic number.

It is an amenable number.

28347137 is a deficient number, since it is larger than the sum of its proper divisors (7165459).

28347137 is a wasteful number, since it uses less digits than its factorization.

28347137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44528 (or 44521 counting only the distinct ones).

The product of its digits is 28224, while the sum is 35.

The square root of 28347137 is about 5324.2029450426. The cubic root of 28347137 is about 304.9086423505.

The spelling of 28347137 in words is "twenty-eight million, three hundred forty-seven thousand, one hundred thirty-seven".