28213536 has 144 divisors (see below), whose sum is σ = 84115584. Its totient is φ = 8266752.

The previous prime is 28213531. The next prime is 28213541. The reversal of 28213536 is 63531282.

It is an interprime number because it is at equal distance from previous prime (28213531) and next prime (28213541).

It is a super-2 number, since 2×28213536² = 1592007227246592, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) 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 (28213531) 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, 600265 + ... + 600311.

It is an arithmetic number, because the mean of its divisors is an integer number (584136).

Almost surely, 2^28213536 is an apocalyptic number.

28213536 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28213536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42057792).

28213536 is an abundant number, since it is smaller than the sum of its proper divisors (55902048).

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

28213536 is a wasteful number, since it uses less digits than its factorization.

28213536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 102 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 28213536 is about 5311.6415541714. The cubic root of 28213536 is about 304.4288729769.

The spelling of 28213536 in words is "twenty-eight million, two hundred thirteen thousand, five hundred thirty-six".