287120340 has 72 divisors (see below), whose sum is σ = 937934088. Its totient is φ = 70675200.

The previous prime is 287120311. The next prime is 287120347. The reversal of 287120340 is 43021782.

It can be written as a sum of positive squares in 4 ways, for example, as 50637456 + 236482884 = 7116^2 + 15378^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287120347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59011 + ... + 63690.

Almost surely, 2^287120340 is an apocalyptic number.

287120340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

287120340 is an abundant number, since it is smaller than the sum of its proper divisors (650813748).

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

287120340 is a wasteful number, since it uses less digits than its factorization.

287120340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122729 (or 122724 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 287120340 is about 16944.6256966626. The cubic root of 287120340 is about 659.7124091375.

The spelling of 287120340 in words is "two hundred eighty-seven million, one hundred twenty thousand, three hundred forty".