28240700 has 18 divisors (see below), whose sum is σ = 61282536. Its totient is φ = 11296240.

The previous prime is 28240699. The next prime is 28240703. The reversal of 28240700 is 704282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28240703) 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, 141104 + ... + 141303.

Almost surely, 2^28240700 is an apocalyptic number.

28240700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28240700 is an abundant number, since it is smaller than the sum of its proper divisors (33041836).

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

28240700 is a wasteful number, since it uses less digits than its factorization.

28240700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282421 (or 282414 counting only the distinct ones).

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

The square root of 28240700 is about 5314.1979639453. The cubic root of 28240700 is about 304.5265430381.

Adding to 28240700 its reverse (704282), we get a palindrome (28944982).

The spelling of 28240700 in words is "twenty-eight million, two hundred forty thousand, seven hundred".