28397636 has 6 divisors (see below), whose sum is σ = 49695870. Its totient is φ = 14198816.

The previous prime is 28397627. The next prime is 28397651. The reversal of 28397636 is 63679382.

It can be written as a sum of positive squares in only one way, i.e., 21215236 + 7182400 = 4606^2 + 2680^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3549701 + ... + 3549708.

It is an arithmetic number, because the mean of its divisors is an integer number (8282645).

Almost surely, 2^28397636 is an apocalyptic number.

It is an amenable number.

28397636 is a deficient number, since it is larger than the sum of its proper divisors (21298234).

28397636 is a wasteful number, since it uses less digits than its factorization.

28397636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7099413 (or 7099411 counting only the distinct ones).

The product of its digits is 326592, while the sum is 44.

The square root of 28397636 is about 5328.9432348262. The cubic root of 28397636 is about 305.0895947483.

The spelling of 28397636 in words is "twenty-eight million, three hundred ninety-seven thousand, six hundred thirty-six".