287855495109 has 36 divisors (see below), whose sum is σ = 520881382476. Its totient is φ = 151835862528.

The previous prime is 287855495093. The next prime is 287855495117. The reversal of 287855495109 is 901594558782.

287855495109 is a `hidden beast` number, since 2 + 8 + 7 + 85 + 549 + 5 + 1 + 0 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 26269278084 + 261586217025 = 162078^2 + 511455^2 .

It is not a de Polignac number, because 287855495109 - 2⁴ = 287855495093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287855495189) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 25099404 + ... + 25110869.

It is an arithmetic number, because the mean of its divisors is an integer number (14468927291).

Almost surely, 2^287855495109 is an apocalyptic number.

It is an amenable number.

287855495109 is a deficient number, since it is larger than the sum of its proper divisors (233025887367).

287855495109 is a wasteful number, since it uses less digits than its factorization.

287855495109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50210306 (or 50210296 counting only the distinct ones).

The product of its (nonzero) digits is 36288000, while the sum is 63.

The spelling of 287855495109 in words is "two hundred eighty-seven billion, eight hundred fifty-five million, four hundred ninety-five thousand, one hundred nine".