287115440 has 40 divisors (see below), whose sum is σ = 696571488. Its totient is φ = 109852160.

The previous prime is 287115419. The next prime is 287115443. The reversal of 287115440 is 44511782.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 287115397 and 287115406.

It is not an unprimeable number, because it can be changed into a prime (287115443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76181 + ... + 79860.

Almost surely, 2^287115440 is an apocalyptic number.

287115440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

287115440 is an abundant number, since it is smaller than the sum of its proper divisors (409456048).

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

287115440 is a wasteful number, since it uses less digits than its factorization.

287115440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156077 (or 156071 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 287115440 is about 16944.4811074285. The cubic root of 287115440 is about 659.7086562289.

The spelling of 287115440 in words is "two hundred eighty-seven million, one hundred fifteen thousand, four hundred forty".