287721616 has 80 divisors (see below), whose sum is σ = 695761024. Its totient is φ = 112223232.

The previous prime is 287721613. The next prime is 287721619. The reversal of 287721616 is 616127782.

287721616 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (287721613) and next prime (287721619).

It is not an unprimeable number, because it can be changed into a prime (287721613) 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, 104935 + ... + 107641.

Almost surely, 2^287721616 is an apocalyptic number.

287721616 is a gapful number since it is divisible by the number (26) 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 287721616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (347880512).

287721616 is an abundant number, since it is smaller than the sum of its proper divisors (408039408).

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

287721616 is a wasteful number, since it uses less digits than its factorization.

287721616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808 (or 2802 counting only the distinct ones).

The product of its digits is 56448, while the sum is 40.

The square root of 287721616 is about 16962.3587982332. The cubic root of 287721616 is about 660.1726025462.

The spelling of 287721616 in words is "two hundred eighty-seven million, seven hundred twenty-one thousand, six hundred sixteen".