28263387 has 4 divisors (see below), whose sum is σ = 37684520. Its totient is φ = 18842256.

The previous prime is 28263383. The next prime is 28263407. The reversal of 28263387 is 78336282.

It is a happy number.

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

It is not a de Polignac number, because 28263387 - 2² = 28263383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28263383) 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, 4710562 + ... + 4710567.

It is an arithmetic number, because the mean of its divisors is an integer number (9421130).

Almost surely, 2^28263387 is an apocalyptic number.

28263387 is a deficient number, since it is larger than the sum of its proper divisors (9421133).

28263387 is an equidigital number, since it uses as much as digits as its factorization.

28263387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9421132.

The product of its digits is 96768, while the sum is 39.

The square root of 28263387 is about 5316.3321002360. The cubic root of 28263387 is about 304.6080677461.

The spelling of 28263387 in words is "twenty-eight million, two hundred sixty-three thousand, three hundred eighty-seven".