28587286 has 48 divisors (see below), whose sum is σ = 56594160. Its totient is φ = 10704960.

The previous prime is 28587283. The next prime is 28587287. The reversal of 28587286 is 68278582.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28587283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23616 + ... + 24796.

It is an arithmetic number, because the mean of its divisors is an integer number (1179045).

Almost surely, 2^28587286 is an apocalyptic number.

28587286 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28587286 is a deficient number, since it is larger than the sum of its proper divisors (28006874).

28587286 is a wasteful number, since it uses less digits than its factorization.

28587286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229 (or 1222 counting only the distinct ones).

The product of its digits is 430080, while the sum is 46.

The square root of 28587286 is about 5346.7079591090. The cubic root of 28587286 is about 305.7672557729.

It can be divided in two parts, 285 and 87286, that added together give a triangular number (87571 = T₄₁₈).

The spelling of 28587286 in words is "twenty-eight million, five hundred eighty-seven thousand, two hundred eighty-six".