1285985280 has 176 divisors, whose sum is σ = 4256449920. Its totient is φ = 330989568.

The previous prime is 1285985263. The next prime is 1285985321. The reversal of 1285985280 is 825895821.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 443997 + ... + 446883.

Almost surely, 2^1285985280 is an apocalyptic number.

1285985280 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 1285985280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2128224960).

1285985280 is an abundant number, since it is smaller than the sum of its proper divisors (2970464640).

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

1285985280 is a wasteful number, since it uses less digits than its factorization.

1285985280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944 (or 2926 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 48.

The square root of 1285985280 is about 35860.6369157047. The cubic root of 1285985280 is about 1087.4567645646.

The spelling of 1285985280 in words is "one billion, two hundred eighty-five million, nine hundred eighty-five thousand, two hundred eighty".