87389273 has 2 divisors, whose sum is σ = 87389274. Its totient is φ = 87389272.

The previous prime is 87389261. The next prime is 87389293. The reversal of 87389273 is 37298378.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71453209 + 15936064 = 8453^2 + 3992^2 .

It is a cyclic number.

It is not a de Polignac number, because 87389273 - 2⁴ = 87389257 is a prime.

It is not a weakly prime, because it can be changed into another prime (87389233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43694636 + 43694637.

It is an arithmetic number, because the mean of its divisors is an integer number (43694637).

Almost surely, 2^87389273 is an apocalyptic number.

It is an amenable number.

87389273 is a deficient number, since it is larger than the sum of its proper divisors (1).

87389273 is an equidigital number, since it uses as much as digits as its factorization.

87389273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 47.

The square root of 87389273 is about 9348.2229862151. Note that the first 3 decimals coincide. The cubic root of 87389273 is about 443.7646552589.

The spelling of 87389273 in words is "eighty-seven million, three hundred eighty-nine thousand, two hundred seventy-three".