28863690 has 32 divisors (see below), whose sum is σ = 69952896. Its totient is φ = 7621440.

The previous prime is 28863683. The next prime is 28863719. The reversal of 28863690 is 9636882.

It is a super-2 number, since 2×28863690² = 1666225200832200, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 1581 + ... + 7760.

It is an arithmetic number, because the mean of its divisors is an integer number (2186028).

Almost surely, 2^28863690 is an apocalyptic number.

28863690 is an abundant number, since it is smaller than the sum of its proper divisors (41089206).

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

28863690 is a wasteful number, since it uses less digits than its factorization.

28863690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9454.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 28863690 is about 5372.4938343380. The cubic root of 28863690 is about 306.7495614492.

The spelling of 28863690 in words is "twenty-eight million, eight hundred sixty-three thousand, six hundred ninety".