28417500 has 120 divisors (see below), whose sum is σ = 92282960. Its totient is φ = 7560000.

The previous prime is 28417481. The next prime is 28417511. The reversal of 28417500 is 571482.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 67290 + ... + 67710.

Almost surely, 2^28417500 is an apocalyptic number.

28417500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28417500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46141480).

28417500 is an abundant number, since it is smaller than the sum of its proper divisors (63865460).

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

28417500 is a wasteful number, since it uses less digits than its factorization.

28417500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 28417500 is about 5330.8066931751. The cubic root of 28417500 is about 305.1607143679.

Adding to 28417500 its reverse (571482), we get a palindrome (28988982).

The spelling of 28417500 in words is "twenty-eight million, four hundred seventeen thousand, five hundred".