1285800000 has 168 divisors, whose sum is σ = 4254227712. Its totient is φ = 342720000.

The previous prime is 1285799951. The next prime is 1285800001. The reversal of 1285800000 is 85821.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1285800001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 598929 + ... + 601071.

It is an arithmetic number, because the mean of its divisors is an integer number (25322784).

Almost surely, 2^1285800000 is an apocalyptic number.

1285800000 is a gapful number since it is divisible by the number (10) 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 1285800000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2127113856).

1285800000 is an abundant number, since it is smaller than the sum of its proper divisors (2968427712).

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

1285800000 is an frugal number, since it uses more digits than its factorization.

1285800000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2183 (or 2153 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 1285800000 is about 35858.0534887213. The cubic root of 1285800000 is about 1087.4045364742.

Adding to 1285800000 its reverse (85821), we get a palindrome (1285885821).

The spelling of 1285800000 in words is "one billion, two hundred eighty-five million, eight hundred thousand".