287288940 has 48 divisors (see below), whose sum is σ = 811546848. Its totient is φ = 75930624.

The previous prime is 287288923. The next prime is 287288941. The reversal of 287288940 is 49882782.

It is a self number, because there is not a number n which added to its sum of digits gives 287288940.

It is not an unprimeable number, because it can be changed into a prime (287288941) 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, 14407 + ... + 27966.

It is an arithmetic number, because the mean of its divisors is an integer number (16907226).

Almost surely, 2^287288940 is an apocalyptic number.

287288940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

287288940 is an abundant number, since it is smaller than the sum of its proper divisors (524257908).

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

287288940 is a wasteful number, since it uses less digits than its factorization.

287288940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42498 (or 42496 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 48.

The square root of 287288940 is about 16949.5999952801. The cubic root of 287288940 is about 659.8415138281.

The spelling of 287288940 in words is "two hundred eighty-seven million, two hundred eighty-eight thousand, nine hundred forty".