28163700 has 216 divisors, whose sum is σ = 97945120. Its totient is φ = 6998400.

The previous prime is 28163699. The next prime is 28163731. The reversal of 28163700 is 736182.

28163700 is a `hidden beast` number, since 28 + 1 + 637 + 0 + 0 = 666.

It is a super-3 number, since 3×28163700³ (a number of 23 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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 71 ways as a sum of consecutive naturals, for example, 461670 + ... + 461730.

Almost surely, 2^28163700 is an apocalyptic number.

28163700 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 28163700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48972560).

28163700 is an abundant number, since it is smaller than the sum of its proper divisors (69781420).

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

28163700 is a wasteful number, since it uses less digits than its factorization.

28163700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 28163700 is about 5306.9482756100. The cubic root of 28163700 is about 304.2495210161.

Adding to 28163700 its reverse (736182), we get a palindrome (28899882).

The spelling of 28163700 in words is "twenty-eight million, one hundred sixty-three thousand, seven hundred".