287790140 has 24 divisors (see below), whose sum is σ = 659301552. Its totient is φ = 104650880.

The previous prime is 287790121. The next prime is 287790157. The reversal of 287790140 is 41097782.

It is a junction number, because it is equal to n+sod(n) for n = 287790094 and 287790103.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 653849 + ... + 654288.

It is an arithmetic number, because the mean of its divisors is an integer number (27470898).

Almost surely, 2^287790140 is an apocalyptic number.

287790140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

287790140 is an abundant number, since it is smaller than the sum of its proper divisors (371511412).

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

287790140 is a wasteful number, since it uses less digits than its factorization.

287790140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308157 (or 1308155 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 287790140 is about 16964.3785621519. The cubic root of 287790140 is about 660.2250074567.

The spelling of 287790140 in words is "two hundred eighty-seven million, seven hundred ninety thousand, one hundred forty".