87643273 has 2 divisors, whose sum is σ = 87643274. Its totient is φ = 87643272.

The previous prime is 87643247. The next prime is 87643301. The reversal of 87643273 is 37234678.

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., 75898944 + 11744329 = 8712^2 + 3427^2 .

It is a cyclic number.

It is not a de Polignac number, because 87643273 - 2²¹ = 85546121 is a prime.

It is not a weakly prime, because it can be changed into another prime (87644273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43821636 + 43821637.

It is an arithmetic number, because the mean of its divisors is an integer number (43821637).

Almost surely, 2^87643273 is an apocalyptic number.

It is an amenable number.

87643273 is a deficient number, since it is larger than the sum of its proper divisors (1).

87643273 is an equidigital number, since it uses as much as digits as its factorization.

87643273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 40.

The square root of 87643273 is about 9361.7985985600. The cubic root of 87643273 is about 444.1941785860.

The spelling of 87643273 in words is "eighty-seven million, six hundred forty-three thousand, two hundred seventy-three".