287721472 has 48 divisors (see below), whose sum is σ = 591006780. Its totient is φ = 139935744.

The previous prime is 287721463. The next prime is 287721479. The reversal of 287721472 is 274127782.

It can be written as a sum of positive squares in 2 ways, for example, as 284394496 + 3326976 = 16864^2 + 1824^2 .

It is not an unprimeable number, because it can be changed into a prime (287721479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73878 + ... + 77674.

Almost surely, 2^287721472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 287721472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295503390).

287721472 is an abundant number, since it is smaller than the sum of its proper divisors (303285308).

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

287721472 is an equidigital number, since it uses as much as digits as its factorization.

287721472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3856 (or 3836 counting only the distinct ones).

The product of its digits is 87808, while the sum is 40.

The square root of 287721472 is about 16962.3545535400. The cubic root of 287721472 is about 660.1724924110.

The spelling of 287721472 in words is "two hundred eighty-seven million, seven hundred twenty-one thousand, four hundred seventy-two".