28306990 has 16 divisors (see below), whose sum is σ = 51671520. Its totient is φ = 11163040.

The previous prime is 28306981. The next prime is 28307003. The reversal of 28306990 is 9960382.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19225 + ... + 20644.

It is an arithmetic number, because the mean of its divisors is an integer number (3229470).

Almost surely, 2^28306990 is an apocalyptic number.

28306990 is a deficient number, since it is larger than the sum of its proper divisors (23364530).

28306990 is a wasteful number, since it uses less digits than its factorization.

28306990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39947.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 28306990 is about 5320.4313734884. The cubic root of 28306990 is about 304.7646307381.

The spelling of 28306990 in words is "twenty-eight million, three hundred six thousand, nine hundred ninety".