287256228578 has 54 divisors (see below), whose sum is σ = 479081242731. Its totient is φ = 129081609800.

The previous prime is 287256228563. The next prime is 287256228601. The reversal of 287256228578 is 875822652782.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 143628114289 + 143628114289 = 378983^2 + 378983^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=378983.

It is a super-2 number, since 2×287256228578² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 287256228578.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1092228875 + ... + 1092229137.

Almost surely, 2^287256228578 is an apocalyptic number.

287256228578 is a deficient number, since it is larger than the sum of its proper divisors (191825014153).

287256228578 is an equidigital number, since it uses as much as digits as its factorization.

287256228578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812 (or 407 counting only the distinct ones).

The product of its digits is 60211200, while the sum is 62.

The spelling of 287256228578 in words is "two hundred eighty-seven billion, two hundred fifty-six million, two hundred twenty-eight thousand, five hundred seventy-eight".