28270400 has 42 divisors (see below), whose sum is σ = 69566790. Its totient is φ = 11307520.

The previous prime is 28270391. The next prime is 28270421. The reversal of 28270400 is 407282.

It can be written as a sum of positive squares in 3 ways, for example, as 222784 + 28047616 = 472^2 + 5296^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7235 + ... + 10434.

Almost surely, 2^28270400 is an apocalyptic number.

28270400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28270400 is an abundant number, since it is smaller than the sum of its proper divisors (41296390).

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

28270400 is a wasteful number, since it uses less digits than its factorization.

28270400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17691 (or 17676 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 28270400 is about 5316.9916306122. The cubic root of 28270400 is about 304.6332598166.

Adding to 28270400 its reverse (407282), we get a palindrome (28677682).

The spelling of 28270400 in words is "twenty-eight million, two hundred seventy thousand, four hundred".