28317900 has 144 divisors (see below), whose sum is σ = 90556704. Its totient is φ = 6789120.

The previous prime is 28317881. The next prime is 28317907. The reversal of 28317900 is 971382.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (28317907) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 206632 + ... + 206768.

It is an arithmetic number, because the mean of its divisors is an integer number (628866).

Almost surely, 2^28317900 is an apocalyptic number.

28317900 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 28317900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45278352).

28317900 is an abundant number, since it is smaller than the sum of its proper divisors (62238804).

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

28317900 is a wasteful number, since it uses less digits than its factorization.

28317900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 28317900 is about 5321.4565675198. The cubic root of 28317900 is about 304.8037795496.

It can be divided in two parts, 2831 and 7900, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 28317900 in words is "twenty-eight million, three hundred seventeen thousand, nine hundred".