1287686400 has 864 divisors, whose sum is σ = 5790962688. Its totient is φ = 243302400.

The previous prime is 1287686381. The next prime is 1287686417. The reversal of 1287686400 is 46867821.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 19219167 + ... + 19219233.

Almost surely, 2^1287686400 is an apocalyptic number.

1287686400 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 1287686400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2895481344).

1287686400 is an abundant number, since it is smaller than the sum of its proper divisors (4503276288).

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

1287686400 is a wasteful number, since it uses less digits than its factorization.

1287686400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 1287686400 is about 35884.3475626909. The cubic root of 1287686400 is about 1087.9360544886.

The spelling of 1287686400 in words is "one billion, two hundred eighty-seven million, six hundred eighty-six thousand, four hundred".