87072472009 has 2 divisors, whose sum is σ = 87072472010. Its totient is φ = 87072472008.

The previous prime is 87072471991. The next prime is 87072472033. The reversal of 87072472009 is 90027427078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47361946384 + 39710525625 = 217628^2 + 199275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87072472009 is a prime.

It is a super-3 number, since 3×87072472009³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87072472009.

It is not a weakly prime, because it can be changed into another prime (87072172009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43536236004 + 43536236005.

It is an arithmetic number, because the mean of its divisors is an integer number (43536236005).

Almost surely, 2^87072472009 is an apocalyptic number.

It is an amenable number.

87072472009 is a deficient number, since it is larger than the sum of its proper divisors (1).

87072472009 is an equidigital number, since it uses as much as digits as its factorization.

87072472009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 395136, while the sum is 46.

The spelling of 87072472009 in words is "eighty-seven billion, seventy-two million, four hundred seventy-two thousand, nine".