28650280 has 16 divisors (see below), whose sum is σ = 64463220. Its totient is φ = 11460096.

The previous prime is 28650277. The next prime is 28650317. The reversal of 28650280 is 8205682.

It can be written as a sum of positive squares in 2 ways, for example, as 24147396 + 4502884 = 4914^2 + 2122^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358089 + ... + 358168.

Almost surely, 2^28650280 is an apocalyptic number.

28650280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28650280 is an abundant number, since it is smaller than the sum of its proper divisors (35812940).

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

28650280 is a wasteful number, since it uses less digits than its factorization.

28650280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716268 (or 716264 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 28650280 is about 5352.5956320275. The cubic root of 28650280 is about 305.9916838841.

The spelling of 28650280 in words is "twenty-eight million, six hundred fifty thousand, two hundred eighty".