87337728173 has 2 divisors, whose sum is σ = 87337728174. Its totient is φ = 87337728172.

The previous prime is 87337728133. The next prime is 87337728199. The reversal of 87337728173 is 37182773378.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83291114404 + 4046613769 = 288602^2 + 63613^2 .

It is a cyclic number.

It is not a de Polignac number, because 87337728173 - 2³² = 83042760877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87337728133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43668864086 + 43668864087.

It is an arithmetic number, because the mean of its divisors is an integer number (43668864087).

Almost surely, 2^87337728173 is an apocalyptic number.

It is an amenable number.

87337728173 is a deficient number, since it is larger than the sum of its proper divisors (1).

87337728173 is an equidigital number, since it uses as much as digits as its factorization.

87337728173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8297856, while the sum is 56.

The spelling of 87337728173 in words is "eighty-seven billion, three hundred thirty-seven million, seven hundred twenty-eight thousand, one hundred seventy-three".