87840673 has 2 divisors, whose sum is σ = 87840674. Its totient is φ = 87840672.

The previous prime is 87840661. The next prime is 87840679. The reversal of 87840673 is 37604878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56670784 + 31169889 = 7528^2 + 5583^2 .

It is a cyclic number.

It is not a de Polignac number, because 87840673 - 2²¹ = 85743521 is a prime.

It is a super-3 number, since 3×87840673³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (87840679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43920336 + 43920337.

It is an arithmetic number, because the mean of its divisors is an integer number (43920337).

Almost surely, 2^87840673 is an apocalyptic number.

It is an amenable number.

87840673 is a deficient number, since it is larger than the sum of its proper divisors (1).

87840673 is an equidigital number, since it uses as much as digits as its factorization.

87840673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 87840673 is about 9372.3355146943. The cubic root of 87840673 is about 444.5274164930.

The spelling of 87840673 in words is "eighty-seven million, eight hundred forty thousand, six hundred seventy-three".