28937286 has 48 divisors (see below), whose sum is σ = 72543744. Its totient is φ = 8165232.

The previous prime is 28937269. The next prime is 28937287. The reversal of 28937286 is 68273982.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28937287) 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, 9075 + ... + 11841.

It is an arithmetic number, because the mean of its divisors is an integer number (1511328).

Almost surely, 2^28937286 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28937286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36271872).

28937286 is an abundant number, since it is smaller than the sum of its proper divisors (43606458).

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

28937286 is a wasteful number, since it uses less digits than its factorization.

28937286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2865 (or 2862 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28937286 is about 5379.3388069539. The cubic root of 28937286 is about 307.0100545961.

The spelling of 28937286 in words is "twenty-eight million, nine hundred thirty-seven thousand, two hundred eighty-six".