28002280 has 16 divisors (see below), whose sum is σ = 63005220. Its totient is φ = 11200896.

The previous prime is 28002277. The next prime is 28002283. The reversal of 28002280 is 8220082.

It is an interprime number because it is at equal distance from previous prime (28002277) and next prime (28002283).

It can be written as a sum of positive squares in 2 ways, for example, as 22867524 + 5134756 = 4782^2 + 2266^2 .

It is not an unprimeable number, because it can be changed into a prime (28002283) 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, 349989 + ... + 350068.

Almost surely, 2^28002280 is an apocalyptic number.

28002280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28002280 is an abundant number, since it is smaller than the sum of its proper divisors (35002940).

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

28002280 is a wasteful number, since it uses less digits than its factorization.

28002280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700068 (or 700064 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 28002280 is about 5291.7180574932. The cubic root of 28002280 is about 303.6671391339.

It can be divided in two parts, 28002 and 280, that added together give a palindrome (28282).

The spelling of 28002280 in words is "twenty-eight million, two thousand, two hundred eighty".