1288431696 has 40 divisors (see below), whose sum is σ = 3391256160. Its totient is φ = 421373056.

The previous prime is 1288431673. The next prime is 1288431709. The reversal of 1288431696 is 6961348821.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

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, 250686 + ... + 255773.

It is an arithmetic number, because the mean of its divisors is an integer number (84781404).

Almost surely, 2^1288431696 is an apocalyptic number.

1288431696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1288431696 is an abundant number, since it is smaller than the sum of its proper divisors (2102824464).

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

1288431696 is a wasteful number, since it uses less digits than its factorization.

1288431696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506523 (or 506517 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 1288431696 is about 35894.7307553630. The cubic root of 1288431696 is about 1088.1459083802.

The spelling of 1288431696 in words is "one billion, two hundred eighty-eight million, four hundred thirty-one thousand, six hundred ninety-six".