28117400 has 24 divisors (see below), whose sum is σ = 65373420. Its totient is φ = 11246880.

The previous prime is 28117391. The next prime is 28117409. The reversal of 28117400 is 471182.

It is an interprime number because it is at equal distance from previous prime (28117391) and next prime (28117409).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28117409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70094 + ... + 70493.

Almost surely, 2^28117400 is an apocalyptic number.

28117400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28117400 is an abundant number, since it is smaller than the sum of its proper divisors (37256020).

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

28117400 is a wasteful number, since it uses less digits than its factorization.

28117400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140603 (or 140594 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 28117400 is about 5302.5842756151. The cubic root of 28117400 is about 304.0827048753.

Adding to 28117400 its reverse (471182), we get a palindrome (28588582).

The spelling of 28117400 in words is "twenty-eight million, one hundred seventeen thousand, four hundred".