28387806 has 16 divisors (see below), whose sum is σ = 58310544. Its totient is φ = 9206784.

The previous prime is 28387787. The next prime is 28387861. The reversal of 28387806 is 60878382.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63715 + ... + 64158.

It is an arithmetic number, because the mean of its divisors is an integer number (3644409).

Almost surely, 2^28387806 is an apocalyptic number.

28387806 is an abundant number, since it is smaller than the sum of its proper divisors (29922738).

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

28387806 is a wasteful number, since it uses less digits than its factorization.

28387806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127915.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 28387806 is about 5328.0208332926. The cubic root of 28387806 is about 305.0543878643.

The spelling of 28387806 in words is "twenty-eight million, three hundred eighty-seven thousand, eight hundred six".