28270100 has 36 divisors (see below), whose sum is σ = 64579200. Its totient is φ = 10712160.

The previous prime is 28270093. The next prime is 28270129. The reversal of 28270100 is 107282.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5540 + ... + 9339.

Almost surely, 2^28270100 is an apocalyptic number.

28270100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28270100 is an abundant number, since it is smaller than the sum of its proper divisors (36309100).

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

28270100 is a wasteful number, since it uses less digits than its factorization.

28270100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14912 (or 14905 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 28270100 is about 5316.9634190955. The cubic root of 28270100 is about 304.6321822431.

Adding to 28270100 its reverse (107282), we get a palindrome (28377382).

The spelling of 28270100 in words is "twenty-eight million, two hundred seventy thousand, one hundred".