28307308 has 6 divisors (see below), whose sum is σ = 49537796. Its totient is φ = 14153652.

The previous prime is 28307269. The next prime is 28307333. The reversal of 28307308 is 80370382.

It is a self number, because there is not a number n which added to its sum of digits gives 28307308.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3538410 + ... + 3538417.

Almost surely, 2^28307308 is an apocalyptic number.

It is an amenable number.

28307308 is a deficient number, since it is larger than the sum of its proper divisors (21230488).

28307308 is a wasteful number, since it uses less digits than its factorization.

28307308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7076831 (or 7076829 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 28307308 is about 5320.4612581993. The cubic root of 28307308 is about 304.7657719732.

The spelling of 28307308 in words is "twenty-eight million, three hundred seven thousand, three hundred eight".