287286403820 has 24 divisors (see below), whose sum is σ = 649709252304. Its totient is φ = 106074979776.

The previous prime is 287286403813. The next prime is 287286403867. The reversal of 287286403820 is 28304682782.

It is a super-2 number, since 2×287286403820² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552473594 + ... + 552474113.

It is an arithmetic number, because the mean of its divisors is an integer number (27071218846).

Almost surely, 2^287286403820 is an apocalyptic number.

287286403820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

287286403820 is an abundant number, since it is smaller than the sum of its proper divisors (362422848484).

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

287286403820 is a wasteful number, since it uses less digits than its factorization.

287286403820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104947729 (or 1104947727 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 50.

The spelling of 287286403820 in words is "two hundred eighty-seven billion, two hundred eighty-six million, four hundred three thousand, eight hundred twenty".