28478500 has 24 divisors (see below), whose sum is σ = 62198136. Its totient is φ = 11391200.

The previous prime is 28478497. The next prime is 28478503. The reversal of 28478500 is 587482.

It is an interprime number because it is at equal distance from previous prime (28478497) and next prime (28478503).

It can be written as a sum of positive squares in 4 ways, for example, as 5207524 + 23270976 = 2282^2 + 4824^2 .

It is a super-2 number, since 2×28478500² = 1622049924500000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28478503) 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, 27979 + ... + 28978.

It is an arithmetic number, because the mean of its divisors is an integer number (2591589).

Almost surely, 2^28478500 is an apocalyptic number.

28478500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28478500 is an abundant number, since it is smaller than the sum of its proper divisors (33719636).

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

28478500 is a wasteful number, since it uses less digits than its factorization.

28478500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56976 (or 56964 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 28478500 is about 5336.5250866083. The cubic root of 28478500 is about 305.3789073844.

The spelling of 28478500 in words is "twenty-eight million, four hundred seventy-eight thousand, five hundred".