287978280 has 64 divisors (see below), whose sum is σ = 866859840. Its totient is φ = 76534272.

The previous prime is 287978227. The next prime is 287978287. The reversal of 287978280 is 82879782.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (287978287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32932 + ... + 40748.

It is an arithmetic number, because the mean of its divisors is an integer number (13544685).

Almost surely, 2^287978280 is an apocalyptic number.

287978280 is a gapful number since it is divisible by the number (20) 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 287978280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (433429920).

287978280 is an abundant number, since it is smaller than the sum of its proper divisors (578881560).

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

287978280 is a wasteful number, since it uses less digits than its factorization.

287978280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8138 (or 8134 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 51.

The square root of 287978280 is about 16969.9228047743. The cubic root of 287978280 is about 660.3688480051.

The spelling of 287978280 in words is "two hundred eighty-seven million, nine hundred seventy-eight thousand, two hundred eighty".