287921189020 has 12 divisors (see below), whose sum is σ = 604634496984. Its totient is φ = 115168475600.

The previous prime is 287921189011. The next prime is 287921189051. The reversal of 287921189020 is 20981129782.

It is a super-2 number, since 2×287921189020² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7198029706 + ... + 7198029745.

It is an arithmetic number, because the mean of its divisors is an integer number (50386208082).

Almost surely, 2^287921189020 is an apocalyptic number.

287921189020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

287921189020 is an abundant number, since it is smaller than the sum of its proper divisors (316713307964).

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

287921189020 is a wasteful number, since it uses less digits than its factorization.

287921189020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14396059460 (or 14396059458 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 49.

The spelling of 287921189020 in words is "two hundred eighty-seven billion, nine hundred twenty-one million, one hundred eighty-nine thousand, twenty".