87673213 has 2 divisors, whose sum is σ = 87673214. Its totient is φ = 87673212.

The previous prime is 87673207. The next prime is 87673247. The reversal of 87673213 is 31237678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82846404 + 4826809 = 9102^2 + 2197^2 .

It is a cyclic number.

It is not a de Polignac number, because 87673213 - 2¹⁷ = 87542141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87673253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43836606 + 43836607.

It is an arithmetic number, because the mean of its divisors is an integer number (43836607).

Almost surely, 2^87673213 is an apocalyptic number.

It is an amenable number.

87673213 is a deficient number, since it is larger than the sum of its proper divisors (1).

87673213 is an equidigital number, since it uses as much as digits as its factorization.

87673213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 37.

The square root of 87673213 is about 9363.3975137233. The cubic root of 87673213 is about 444.2447535252.

The spelling of 87673213 in words is "eighty-seven million, six hundred seventy-three thousand, two hundred thirteen".