87445829 has 2 divisors, whose sum is σ = 87445830. Its totient is φ = 87445828.

The previous prime is 87445781. The next prime is 87445859. The reversal of 87445829 is 92854478.

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., 68973025 + 18472804 = 8305^2 + 4298^2 .

It is a cyclic number.

It is not a de Polignac number, because 87445829 - 2¹² = 87441733 is a prime.

It is a super-3 number, since 3×87445829³ (a number of 25 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87445859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43722914 + 43722915.

It is an arithmetic number, because the mean of its divisors is an integer number (43722915).

Almost surely, 2^87445829 is an apocalyptic number.

It is an amenable number.

87445829 is a deficient number, since it is larger than the sum of its proper divisors (1).

87445829 is an equidigital number, since it uses as much as digits as its factorization.

87445829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 47.

The square root of 87445829 is about 9351.2474568904. The cubic root of 87445829 is about 443.8603654865.

The spelling of 87445829 in words is "eighty-seven million, four hundred forty-five thousand, eight hundred twenty-nine".