87328973 has 2 divisors, whose sum is σ = 87328974. Its totient is φ = 87328972.

The previous prime is 87328963. The next prime is 87328987. The reversal of 87328973 is 37982378.

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., 86081284 + 1247689 = 9278^2 + 1117^2 .

It is a cyclic number.

It is not a de Polignac number, because 87328973 - 2⁴ = 87328957 is a prime.

It is a super-3 number, since 3×87328973³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87328933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43664486 + 43664487.

It is an arithmetic number, because the mean of its divisors is an integer number (43664487).

Almost surely, 2^87328973 is an apocalyptic number.

It is an amenable number.

87328973 is a deficient number, since it is larger than the sum of its proper divisors (1).

87328973 is an equidigital number, since it uses as much as digits as its factorization.

87328973 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 87328973 is about 9344.9972177631. The cubic root of 87328973 is about 443.6625635304.

The spelling of 87328973 in words is "eighty-seven million, three hundred twenty-eight thousand, nine hundred seventy-three".