28272680 has 32 divisors (see below), whose sum is σ = 65809800. Its totient is φ = 10918656.

The previous prime is 28272679. The next prime is 28272689. The reversal of 28272680 is 8627282.

It can be written as a sum of positive squares in 4 ways, for example, as 20666116 + 7606564 = 4546^2 + 2758^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28272680.

It is not an unprimeable number, because it can be changed into a prime (28272689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11027 + ... + 13346.

Almost surely, 2^28272680 is an apocalyptic number.

28272680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28272680 is an abundant number, since it is smaller than the sum of its proper divisors (37537120).

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

28272680 is a wasteful number, since it uses less digits than its factorization.

28272680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24413 (or 24409 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 28272680 is about 5317.2060332472. The cubic root of 28272680 is about 304.6414491261.

The spelling of 28272680 in words is "twenty-eight million, two hundred seventy-two thousand, six hundred eighty".