28097236 has 6 divisors (see below), whose sum is σ = 49170170. Its totient is φ = 14048616.

The previous prime is 28097233. The next prime is 28097287. The reversal of 28097236 is 63279082.

It can be written as a sum of positive squares in only one way, i.e., 26584336 + 1512900 = 5156^2 + 1230^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28097195 and 28097204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28097231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3512151 + ... + 3512158.

Almost surely, 2^28097236 is an apocalyptic number.

It is an amenable number.

28097236 is a deficient number, since it is larger than the sum of its proper divisors (21072934).

28097236 is a wasteful number, since it uses less digits than its factorization.

28097236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7024313 (or 7024311 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 28097236 is about 5300.6825975529. The cubic root of 28097236 is about 304.0099979399.

The spelling of 28097236 in words is "twenty-eight million, ninety-seven thousand, two hundred thirty-six".