28428280 has 32 divisors (see below), whose sum is σ = 64436400. Its totient is φ = 11287296.

The previous prime is 28428259. The next prime is 28428287. The reversal of 28428280 is 8282482.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28428287) 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, 3004 + ... + 8116.

Almost surely, 2^28428280 is an apocalyptic number.

28428280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28428280 is an abundant number, since it is smaller than the sum of its proper divisors (36008120).

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

28428280 is a wasteful number, since it uses less digits than its factorization.

28428280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5263 (or 5259 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 34.

The square root of 28428280 is about 5331.8177013098. The cubic root of 28428280 is about 305.1992964226.

The spelling of 28428280 in words is "twenty-eight million, four hundred twenty-eight thousand, two hundred eighty".