1285857264 has 40 divisors (see below), whose sum is σ = 3326116480. Its totient is φ = 428061888.

The previous prime is 1285857257. The next prime is 1285857283. The reversal of 1285857264 is 4627585821.

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 7 ways as a sum of consecutive naturals, for example, 20757 + ... + 54795.

It is an arithmetic number, because the mean of its divisors is an integer number (83152912).

Almost surely, 2^1285857264 is an apocalyptic number.

It is an amenable number.

1285857264 is an abundant number, since it is smaller than the sum of its proper divisors (2040259216).

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

1285857264 is a wasteful number, since it uses less digits than its factorization.

1285857264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34837 (or 34831 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 48.

The square root of 1285857264 is about 35858.8519615450. The cubic root of 1285857264 is about 1087.4206790078.

The spelling of 1285857264 in words is "one billion, two hundred eighty-five million, eight hundred fifty-seven thousand, two hundred sixty-four".