287620922881 has 4 divisors (see below), whose sum is σ = 287699878192. Its totient is φ = 287541967572.

The previous prime is 287620922873. The next prime is 287620922887. The reversal of 287620922881 is 188229026782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 287620922881 - 2³ = 287620922873 is a prime.

It is a super-2 number, since 2×287620922881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (287620922887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39472191 + ... + 39479476.

It is an arithmetic number, because the mean of its divisors is an integer number (71924969548).

Almost surely, 2^287620922881 is an apocalyptic number.

It is an amenable number.

287620922881 is a deficient number, since it is larger than the sum of its proper divisors (78955311).

287620922881 is an equidigital number, since it uses as much as digits as its factorization.

287620922881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78955310.

The product of its (nonzero) digits is 3096576, while the sum is 55.

The spelling of 287620922881 in words is "two hundred eighty-seven billion, six hundred twenty million, nine hundred twenty-two thousand, eight hundred eighty-one".