28887286 has 4 divisors (see below), whose sum is σ = 43330932. Its totient is φ = 14443642.

The previous prime is 28887283. The next prime is 28887307. The reversal of 28887286 is 68278882.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28887283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7221820 + ... + 7221823.

It is an arithmetic number, because the mean of its divisors is an integer number (10832733).

Almost surely, 2^28887286 is an apocalyptic number.

28887286 is a deficient number, since it is larger than the sum of its proper divisors (14443646).

28887286 is a wasteful number, since it uses less digits than its factorization.

28887286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14443645.

The product of its digits is 688128, while the sum is 49.

The square root of 28887286 is about 5374.6893863739. The cubic root of 28887286 is about 306.8331277013.

The spelling of 28887286 in words is "twenty-eight million, eight hundred eighty-seven thousand, two hundred eighty-six".