28263380 has 12 divisors (see below), whose sum is σ = 59353140. Its totient is φ = 11305344.

The previous prime is 28263379. The next prime is 28263383. The reversal of 28263380 is 8336282.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15100996 + 13162384 = 3886^2 + 3628^2 .

It is a hoax number, since the sum of its digits (32) 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 (28263383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 706565 + ... + 706604.

It is an arithmetic number, because the mean of its divisors is an integer number (4946095).

Almost surely, 2^28263380 is an apocalyptic number.

28263380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28263380 is an abundant number, since it is smaller than the sum of its proper divisors (31089760).

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

28263380 is a wasteful number, since it uses less digits than its factorization.

28263380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413178 (or 1413176 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 28263380 is about 5316.3314418873. The cubic root of 28263380 is about 304.6080425986.

The spelling of 28263380 in words is "twenty-eight million, two hundred sixty-three thousand, three hundred eighty".