28387303 has 4 divisors (see below), whose sum is σ = 32442640. Its totient is φ = 24331968.

The previous prime is 28387283. The next prime is 28387309. The reversal of 28387303 is 30378382.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28387303 - 2⁹ = 28386791 is a prime.

It is a super-2 number, since 2×28387303² = 1611677943227618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28387309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2027658 + ... + 2027671.

It is an arithmetic number, because the mean of its divisors is an integer number (8110660).

Almost surely, 2^28387303 is an apocalyptic number.

28387303 is a deficient number, since it is larger than the sum of its proper divisors (4055337).

28387303 is an equidigital number, since it uses as much as digits as its factorization.

28387303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4055336.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 28387303 is about 5327.9736298146. The cubic root of 28387303 is about 305.0525861134.

The spelling of 28387303 in words is "twenty-eight million, three hundred eighty-seven thousand, three hundred three".