287937920 has 128 divisors (see below), whose sum is σ = 742625280. Its totient is φ = 106444800.

The previous prime is 287937907. The next prime is 287937929. The reversal of 287937920 is 29739782.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287937929) 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, 456005 + ... + 456635.

It is an arithmetic number, because the mean of its divisors is an integer number (5801760).

Almost surely, 2^287937920 is an apocalyptic number.

287937920 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 287937920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (371312640).

287937920 is an abundant number, since it is smaller than the sum of its proper divisors (454687360).

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

287937920 is a wasteful number, since it uses less digits than its factorization.

287937920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704 (or 692 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 287937920 is about 16968.7336003604. The cubic root of 287937920 is about 660.3379964516.

The spelling of 287937920 in words is "two hundred eighty-seven million, nine hundred thirty-seven thousand, nine hundred twenty".