287996128 has 72 divisors (see below), whose sum is σ = 670597704. Its totient is φ = 121363200.

The previous prime is 287996113. The next prime is 287996141. The reversal of 287996128 is 821699782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94143 + ... + 97153.

It is an arithmetic number, because the mean of its divisors is an integer number (9313857).

Almost surely, 2^287996128 is an apocalyptic number.

287996128 is a gapful number since it is divisible by the number (28) 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 287996128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335298852).

287996128 is an abundant number, since it is smaller than the sum of its proper divisors (382601576).

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

287996128 is a wasteful number, since it uses less digits than its factorization.

287996128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096 (or 3081 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The square root of 287996128 is about 16970.4486681997. The cubic root of 287996128 is about 660.3824902605.

The spelling of 287996128 in words is "two hundred eighty-seven million, nine hundred ninety-six thousand, one hundred twenty-eight".