28179900 has 270 divisors, whose sum is σ = 107758728. Its totient is φ = 6350400.

The previous prime is 28179883. The next prime is 28179901. The reversal of 28179900 is 997182.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (270).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28179901) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 396865 + ... + 396935.

Almost surely, 2^28179900 is an apocalyptic number.

28179900 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 28179900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53879364).

28179900 is an abundant number, since it is smaller than the sum of its proper divisors (79578828).

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

28179900 is a wasteful number, since it uses less digits than its factorization.

28179900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 28179900 is about 5308.4743571011. The cubic root of 28179900 is about 304.3078454728.

The spelling of 28179900 in words is "twenty-eight million, one hundred seventy-nine thousand, nine hundred".