28750100 has 18 divisors (see below), whose sum is σ = 62387934. Its totient is φ = 11500000.

The previous prime is 28750087. The next prime is 28750109. The reversal of 28750100 is 105782.

It can be written as a sum of positive squares in 3 ways, for example, as 148996 + 28601104 = 386^2 + 5348^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28750109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 143651 + ... + 143850.

Almost surely, 2^28750100 is an apocalyptic number.

28750100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28750100 is an abundant number, since it is smaller than the sum of its proper divisors (33637834).

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

28750100 is a wasteful number, since it uses less digits than its factorization.

28750100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287515 (or 287508 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 28750100 is about 5361.9119724218. The cubic root of 28750100 is about 306.3466389451.

Adding to 28750100 its reverse (105782), we get a palindrome (28855882).

The spelling of 28750100 in words is "twenty-eight million, seven hundred fifty thousand, one hundred".