28140786 has 48 divisors (see below), whose sum is σ = 64864800. Its totient is φ = 8792064.

The previous prime is 28140781. The next prime is 28140793. The reversal of 28140786 is 68704182.

It is a self number, because there is not a number n which added to its sum of digits gives 28140786.

It is not an unprimeable number, because it can be changed into a prime (28140781) 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, 36210 + ... + 36978.

It is an arithmetic number, because the mean of its divisors is an integer number (1351350).

Almost surely, 2^28140786 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28140786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32432400).

28140786 is an abundant number, since it is smaller than the sum of its proper divisors (36724014).

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

28140786 is a wasteful number, since it uses less digits than its factorization.

28140786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903 (or 900 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28140786 is about 5304.7889684699. The cubic root of 28140786 is about 304.1669861092.

The spelling of 28140786 in words is "twenty-eight million, one hundred forty thousand, seven hundred eighty-six".