287896856 has 64 divisors (see below), whose sum is σ = 598617600. Its totient is φ = 128988288.

The previous prime is 287896841. The next prime is 287896859. The reversal of 287896856 is 658698782.

It is a junction number, because it is equal to n+sod(n) for n = 287896795 and 287896804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287896859) 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, 550211 + ... + 550733.

It is an arithmetic number, because the mean of its divisors is an integer number (9353400).

Almost surely, 2^287896856 is an apocalyptic number.

287896856 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 287896856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299308800).

287896856 is an abundant number, since it is smaller than the sum of its proper divisors (310720744).

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

287896856 is a wasteful number, since it uses less digits than its factorization.

287896856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688 (or 684 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 59.

The square root of 287896856 is about 16967.5235670972. The cubic root of 287896856 is about 660.3066037952.

The spelling of 287896856 in words is "two hundred eighty-seven million, eight hundred ninety-six thousand, eight hundred fifty-six".