1285681332 has 48 divisors (see below), whose sum is σ = 3249429120. Its totient is φ = 393299328.

The previous prime is 1285681289. The next prime is 1285681333. The reversal of 1285681332 is 2331865821.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285681333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3169 + ... + 50807.

It is an arithmetic number, because the mean of its divisors is an integer number (67696440).

Almost surely, 2^1285681332 is an apocalyptic number.

1285681332 is a gapful number since it is divisible by the number (12) 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 1285681332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1624714560).

1285681332 is an abundant number, since it is smaller than the sum of its proper divisors (1963747788).

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

1285681332 is a wasteful number, since it uses less digits than its factorization.

1285681332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47832 (or 47830 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 1285681332 is about 35856.3987594962. The cubic root of 1285681332 is about 1087.3710828289.

The spelling of 1285681332 in words is "one billion, two hundred eighty-five million, six hundred eighty-one thousand, three hundred thirty-two".