28690312 has 32 divisors (see below), whose sum is σ = 61657920. Its totient is φ = 12260160.

The previous prime is 28690297. The next prime is 28690379. The reversal of 28690312 is 21309682.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29823 + ... + 30769.

It is an arithmetic number, because the mean of its divisors is an integer number (1926810).

Almost surely, 2^28690312 is an apocalyptic number.

It is an amenable number.

28690312 is an abundant number, since it is smaller than the sum of its proper divisors (32967608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28690312 is a wasteful number, since it uses less digits than its factorization.

28690312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501 (or 1497 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 28690312 is about 5356.3338208144. Note that the first 3 decimals coincide. The cubic root of 28690312 is about 306.1341345951.

Adding to 28690312 its reverse (21309682), we get a palindrome (49999994).

The spelling of 28690312 in words is "twenty-eight million, six hundred ninety thousand, three hundred twelve".