87810385 has 16 divisors (see below), whose sum is σ = 113911056. Its totient is φ = 64597248.

The previous prime is 87810367. The next prime is 87810403. The reversal of 87810385 is 58301878.

It is an interprime number because it is at equal distance from previous prime (87810367) and next prime (87810403).

It can be written as a sum of positive squares in 8 ways, for example, as 24830289 + 62980096 = 4983^2 + 7936^2 .

It is a cyclic number.

It is not a de Polignac number, because 87810385 - 2⁵ = 87810353 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15567 + ... + 20443.

It is an arithmetic number, because the mean of its divisors is an integer number (7119441).

Almost surely, 2^87810385 is an apocalyptic number.

It is an amenable number.

87810385 is a deficient number, since it is larger than the sum of its proper divisors (26100671).

87810385 is a wasteful number, since it uses less digits than its factorization.

87810385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5172.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 87810385 is about 9370.7195561494. The cubic root of 87810385 is about 444.4763186978.

The spelling of 87810385 in words is "eighty-seven million, eight hundred ten thousand, three hundred eighty-five".