287672161 has 4 divisors (see below), whose sum is σ = 328768192. Its totient is φ = 246576132.

The previous prime is 287672149. The next prime is 287672171. The reversal of 287672161 is 161276782.

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 287672161 - 2⁵ = 287672129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (287672131) 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, 20548005 + ... + 20548018.

It is an arithmetic number, because the mean of its divisors is an integer number (82192048).

Almost surely, 2^287672161 is an apocalyptic number.

It is an amenable number.

287672161 is a deficient number, since it is larger than the sum of its proper divisors (41096031).

287672161 is an equidigital number, since it uses as much as digits as its factorization.

287672161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41096030.

The product of its digits is 56448, while the sum is 40.

The square root of 287672161 is about 16960.9009489473. The cubic root of 287672161 is about 660.1347758125.

It can be divided in two parts, 2876721 and 61, that added together give a palindrome (2876782).

The spelling of 287672161 in words is "two hundred eighty-seven million, six hundred seventy-two thousand, one hundred sixty-one".