28770100 has 18 divisors (see below), whose sum is σ = 62431334. Its totient is φ = 11508000.

The previous prime is 28770097. The next prime is 28770113. The reversal of 28770100 is 107782.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 5363856 + 23406244 = 2316^2 + 4838^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 143751 + ... + 143950.

Almost surely, 2^28770100 is an apocalyptic number.

28770100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28770100 is an abundant number, since it is smaller than the sum of its proper divisors (33661234).

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

28770100 is a wasteful number, since it uses less digits than its factorization.

28770100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287715 (or 287708 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 28770100 is about 5363.7766545597. The cubic root of 28770100 is about 306.4176591340.

Adding to 28770100 its reverse (107782), we get a palindrome (28877882).

The spelling of 28770100 in words is "twenty-eight million, seven hundred seventy thousand, one hundred".